diff --git a/api/app/Http/Requests/Api/V1/StoreOrganisationRequest.php b/api/app/Http/Requests/Api/V1/StoreOrganisationRequest.php
index baa1110f..667d0caf 100644
--- a/api/app/Http/Requests/Api/V1/StoreOrganisationRequest.php
+++ b/api/app/Http/Requests/Api/V1/StoreOrganisationRequest.php
@@ -21,6 +21,11 @@ final class StoreOrganisationRequest extends FormRequest
             'slug' => ['required', 'string', 'max:255', 'unique:organisations,slug', 'regex:/^[a-z0-9-]+$/'],
             'billing_status' => ['sometimes', 'string', 'in:trial,active,suspended,cancelled'],
             'settings' => ['sometimes', 'array'],
+            'email_logo_url' => ['nullable', 'url', 'max:500'],
+            'email_primary_color' => ['nullable', 'string', 'regex:/^#[0-9A-Fa-f]{6}$/'],
+            'email_reply_to' => ['nullable', 'email'],
+            'email_sender_name' => ['nullable', 'string', 'max:100'],
+            'email_footer_text' => ['nullable', 'string', 'max:2000'],
         ];
     }
 }
diff --git a/api/app/Http/Requests/Api/V1/UpdateOrganisationRequest.php b/api/app/Http/Requests/Api/V1/UpdateOrganisationRequest.php
index d97aee8c..73842ea6 100644
--- a/api/app/Http/Requests/Api/V1/UpdateOrganisationRequest.php
+++ b/api/app/Http/Requests/Api/V1/UpdateOrganisationRequest.php
@@ -25,6 +25,11 @@ final class UpdateOrganisationRequest extends FormRequest
             ],
             'billing_status' => ['sometimes', 'string', 'in:active,trial,suspended'],
             'settings' => ['sometimes', 'array'],
+            'email_logo_url' => ['nullable', 'url', 'max:500'],
+            'email_primary_color' => ['nullable', 'string', 'regex:/^#[0-9A-Fa-f]{6}$/'],
+            'email_reply_to' => ['nullable', 'email'],
+            'email_sender_name' => ['nullable', 'string', 'max:100'],
+            'email_footer_text' => ['nullable', 'string', 'max:2000'],
         ];
     }
 }
diff --git a/api/app/Http/Resources/Api/V1/OrganisationResource.php b/api/app/Http/Resources/Api/V1/OrganisationResource.php
index 34c96910..768ed976 100644
--- a/api/app/Http/Resources/Api/V1/OrganisationResource.php
+++ b/api/app/Http/Resources/Api/V1/OrganisationResource.php
@@ -17,6 +17,11 @@ final class OrganisationResource extends JsonResource
             'slug' => $this->slug,
             'billing_status' => $this->billing_status,
             'settings' => $this->settings,
+            'email_logo_url' => $this->email_logo_url,
+            'email_primary_color' => $this->email_primary_color,
+            'email_reply_to' => $this->email_reply_to,
+            'email_sender_name' => $this->email_sender_name,
+            'email_footer_text' => $this->email_footer_text,
             'created_at' => $this->created_at->toIso8601String(),
             'updated_at' => $this->updated_at->toIso8601String(),
         ];
diff --git a/api/app/Mail/CrewliMailable.php b/api/app/Mail/CrewliMailable.php
new file mode 100644
index 00000000..0090ce01
--- /dev/null
+++ b/api/app/Mail/CrewliMailable.php
@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mail;
+
+use App\Models\Organisation;
+use App\Services\MailBrandingService;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Mail\Mailable;
+use Illuminate\Queue\SerializesModels;
+
+abstract class CrewliMailable extends Mailable implements ShouldQueue
+{
+    use Queueable;
+    use SerializesModels;
+
+    protected Organisation $organisation;
+
+    public function __construct(Organisation $organisation)
+    {
+        $this->organisation = $organisation;
+    }
+
+    protected function buildBranding(): static
+    {
+        $branding = app(MailBrandingService::class)->getBranding($this->organisation);
+
+        $this->from(
+            config('mail.from.address'),
+            $branding['sender_name']
+        );
+
+        if ($branding['reply_to']) {
+            $this->replyTo($branding['reply_to']);
+        }
+
+        return $this->with('branding', $branding);
+    }
+}
diff --git a/api/app/Mail/InvitationMail.php b/api/app/Mail/InvitationMail.php
index 8efb19f1..18f38ded 100644
--- a/api/app/Mail/InvitationMail.php
+++ b/api/app/Mail/InvitationMail.php
@@ -5,21 +5,18 @@ declare(strict_types=1);
 namespace App\Mail;
 
 use App\Models\UserInvitation;
-use Illuminate\Bus\Queueable;
-use Illuminate\Contracts\Queue\ShouldQueue;
-use Illuminate\Mail\Mailable;
 use Illuminate\Mail\Mailables\Content;
 use Illuminate\Mail\Mailables\Envelope;
-use Illuminate\Queue\SerializesModels;
 
-final class InvitationMail extends Mailable implements ShouldQueue
+final class InvitationMail extends CrewliMailable
 {
-    use Queueable;
-    use SerializesModels;
+    public UserInvitation $invitation;
 
-    public function __construct(
-        public readonly UserInvitation $invitation,
-    ) {}
+    public function __construct(UserInvitation $invitation)
+    {
+        parent::__construct($invitation->organisation);
+        $this->invitation = $invitation;
+    }
 
     public function envelope(): Envelope
     {
@@ -30,11 +27,12 @@ final class InvitationMail extends Mailable implements ShouldQueue
 
     public function content(): Content
     {
+        $this->buildBranding();
+
         return new Content(
-            markdown: 'emails.invitation',
+            view: 'mail.invitation',
             with: [
-                'acceptUrl' => config('app.frontend_app_url') . '/invitations/' . $this->invitation->token . '/accept',
-                'organisationName' => $this->invitation->organisation->name,
+                'acceptUrl' => config('crewli.app_url') . '/invitations/' . $this->invitation->token . '/accept',
                 'inviterName' => $this->invitation->invitedBy?->name ?? 'Een beheerder',
                 'role' => $this->invitation->role,
                 'expiresAt' => $this->invitation->expires_at,
diff --git a/api/app/Mail/RegistrationApprovedMail.php b/api/app/Mail/RegistrationApprovedMail.php
index 4a2cab90..7d569138 100644
--- a/api/app/Mail/RegistrationApprovedMail.php
+++ b/api/app/Mail/RegistrationApprovedMail.php
@@ -6,22 +6,20 @@ namespace App\Mail;
 
 use App\Models\Event;
 use App\Models\Person;
-use Illuminate\Bus\Queueable;
-use Illuminate\Contracts\Queue\ShouldQueue;
-use Illuminate\Mail\Mailable;
 use Illuminate\Mail\Mailables\Content;
 use Illuminate\Mail\Mailables\Envelope;
-use Illuminate\Queue\SerializesModels;
 
-final class RegistrationApprovedMail extends Mailable implements ShouldQueue
+final class RegistrationApprovedMail extends CrewliMailable
 {
-    use Queueable;
-    use SerializesModels;
+    public Person $person;
+    public Event $event;
 
-    public function __construct(
-        public readonly Person $person,
-        public readonly Event $event,
-    ) {}
+    public function __construct(Person $person, Event $event)
+    {
+        parent::__construct($event->organisation);
+        $this->person = $person;
+        $this->event = $event;
+    }
 
     public function envelope(): Envelope
     {
@@ -32,12 +30,14 @@ final class RegistrationApprovedMail extends Mailable implements ShouldQueue
 
     public function content(): Content
     {
+        $this->buildBranding();
+
         return new Content(
-            markdown: 'emails.registration-approved',
+            view: 'mail.registration-approved',
             with: [
-                'personName' => $this->person->first_name,
-                'eventName' => $this->event->name,
-                'portalUrl' => config('app.frontend_portal_url'),
+                'person' => $this->person,
+                'event' => $this->event,
+                'portalUrl' => config('crewli.portal_url'),
             ],
         );
     }
diff --git a/api/app/Mail/RegistrationConfirmationMail.php b/api/app/Mail/RegistrationConfirmationMail.php
index db6a3272..6fa88b5f 100644
--- a/api/app/Mail/RegistrationConfirmationMail.php
+++ b/api/app/Mail/RegistrationConfirmationMail.php
@@ -6,22 +6,20 @@ namespace App\Mail;
 
 use App\Models\Event;
 use App\Models\Person;
-use Illuminate\Bus\Queueable;
-use Illuminate\Contracts\Queue\ShouldQueue;
-use Illuminate\Mail\Mailable;
 use Illuminate\Mail\Mailables\Content;
 use Illuminate\Mail\Mailables\Envelope;
-use Illuminate\Queue\SerializesModels;
 
-final class RegistrationConfirmationMail extends Mailable implements ShouldQueue
+final class RegistrationConfirmationMail extends CrewliMailable
 {
-    use Queueable;
-    use SerializesModels;
+    public Person $person;
+    public Event $event;
 
-    public function __construct(
-        public readonly Person $person,
-        public readonly Event $event,
-    ) {}
+    public function __construct(Person $person, Event $event)
+    {
+        parent::__construct($event->organisation);
+        $this->person = $person;
+        $this->event = $event;
+    }
 
     public function envelope(): Envelope
     {
@@ -32,14 +30,14 @@ final class RegistrationConfirmationMail extends Mailable implements ShouldQueue
 
     public function content(): Content
     {
+        $this->buildBranding();
+
         return new Content(
-            markdown: 'emails.registration-confirmation',
+            view: 'mail.registration-confirmation',
             with: [
-                'personName' => $this->person->first_name,
-                'eventName' => $this->event->name,
-                'startDate' => $this->event->start_date->format('d-m-Y'),
-                'endDate' => $this->event->end_date->format('d-m-Y'),
-                'portalUrl' => config('app.frontend_portal_url'),
+                'person' => $this->person,
+                'event' => $this->event,
+                'portalUrl' => config('crewli.portal_url'),
             ],
         );
     }
diff --git a/api/app/Mail/RegistrationRejectedMail.php b/api/app/Mail/RegistrationRejectedMail.php
index d1848b01..9664fa57 100644
--- a/api/app/Mail/RegistrationRejectedMail.php
+++ b/api/app/Mail/RegistrationRejectedMail.php
@@ -6,23 +6,22 @@ namespace App\Mail;
 
 use App\Models\Event;
 use App\Models\Person;
-use Illuminate\Bus\Queueable;
-use Illuminate\Contracts\Queue\ShouldQueue;
-use Illuminate\Mail\Mailable;
 use Illuminate\Mail\Mailables\Content;
 use Illuminate\Mail\Mailables\Envelope;
-use Illuminate\Queue\SerializesModels;
 
-final class RegistrationRejectedMail extends Mailable implements ShouldQueue
+final class RegistrationRejectedMail extends CrewliMailable
 {
-    use Queueable;
-    use SerializesModels;
+    public Person $person;
+    public Event $event;
+    public ?string $reason;
 
-    public function __construct(
-        public readonly Person $person,
-        public readonly Event $event,
-        public readonly ?string $reason = null,
-    ) {}
+    public function __construct(Person $person, Event $event, ?string $reason = null)
+    {
+        parent::__construct($event->organisation);
+        $this->person = $person;
+        $this->event = $event;
+        $this->reason = $reason;
+    }
 
     public function envelope(): Envelope
     {
@@ -33,11 +32,13 @@ final class RegistrationRejectedMail extends Mailable implements ShouldQueue
 
     public function content(): Content
     {
+        $this->buildBranding();
+
         return new Content(
-            markdown: 'emails.registration-rejected',
+            view: 'mail.registration-rejected',
             with: [
-                'personName' => $this->person->first_name,
-                'eventName' => $this->event->name,
+                'person' => $this->person,
+                'event' => $this->event,
                 'reason' => $this->reason,
             ],
         );
diff --git a/api/app/Models/Organisation.php b/api/app/Models/Organisation.php
index c20eb580..4e967232 100644
--- a/api/app/Models/Organisation.php
+++ b/api/app/Models/Organisation.php
@@ -22,6 +22,11 @@ final class Organisation extends Model
         'slug',
         'billing_status',
         'settings',
+        'email_logo_url',
+        'email_primary_color',
+        'email_reply_to',
+        'email_sender_name',
+        'email_footer_text',
     ];
 
     protected function casts(): array
diff --git a/api/app/Services/MailBrandingService.php b/api/app/Services/MailBrandingService.php
new file mode 100644
index 00000000..4a5855b2
--- /dev/null
+++ b/api/app/Services/MailBrandingService.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services;
+
+use App\Models\Organisation;
+
+final class MailBrandingService
+{
+    /**
+     * @return array<string, mixed>
+     */
+    public function getBranding(Organisation $organisation): array
+    {
+        return [
+            'organisation_name' => $organisation->name,
+            'logo_url' => $organisation->email_logo_url ?? config('crewli.default_logo_url'),
+            'primary_color' => $organisation->email_primary_color ?? '#6366f1',
+            'reply_to' => $organisation->email_reply_to,
+            'sender_name' => $organisation->email_sender_name ?? $organisation->name,
+            'footer_text' => $organisation->email_footer_text,
+        ];
+    }
+}
diff --git a/api/config/crewli.php b/api/config/crewli.php
new file mode 100644
index 00000000..0c85b70b
--- /dev/null
+++ b/api/config/crewli.php
@@ -0,0 +1,7 @@
+<?php
+
+return [
+    'default_logo_url' => env('CREWLI_DEFAULT_LOGO_URL'),
+    'portal_url' => env('CREWLI_PORTAL_URL', 'http://localhost:5175'),
+    'app_url' => env('CREWLI_APP_URL', 'http://localhost:5174'),
+];
diff --git a/api/database/migrations/2026_04_13_100000_add_email_branding_to_organisations_table.php b/api/database/migrations/2026_04_13_100000_add_email_branding_to_organisations_table.php
new file mode 100644
index 00000000..3f0fb20d
--- /dev/null
+++ b/api/database/migrations/2026_04_13_100000_add_email_branding_to_organisations_table.php
@@ -0,0 +1,34 @@
+<?php
+
+declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('organisations', function (Blueprint $table) {
+            $table->string('email_logo_url', 500)->nullable()->after('settings');
+            $table->string('email_primary_color', 7)->nullable()->after('email_logo_url');
+            $table->string('email_reply_to')->nullable()->after('email_primary_color');
+            $table->string('email_sender_name', 100)->nullable()->after('email_reply_to');
+            $table->text('email_footer_text')->nullable()->after('email_sender_name');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('organisations', function (Blueprint $table) {
+            $table->dropColumn([
+                'email_logo_url',
+                'email_primary_color',
+                'email_reply_to',
+                'email_sender_name',
+                'email_footer_text',
+            ]);
+        });
+    }
+};
diff --git a/api/resources/views/mail/invitation.blade.php b/api/resources/views/mail/invitation.blade.php
new file mode 100644
index 00000000..f0f8b99b
--- /dev/null
+++ b/api/resources/views/mail/invitation.blade.php
@@ -0,0 +1,15 @@
+@extends('mail.layouts.crewli')
+
+@section('title')
+    Je bent uitgenodigd!
+@endsection
+
+@section('content')
+    <p style="margin: 0 0 16px;">{{ $inviterName }} heeft je uitgenodigd om deel te nemen als <strong>{{ $role }}</strong>.</p>
+
+    <p style="margin: 0;">Deze uitnodiging verloopt op <strong>{{ $expiresAt->format('d-m-Y H:i') }}</strong> (over 7 dagen).</p>
+@endsection
+
+@section('action')
+    <a href="{{ $acceptUrl }}" style="display: inline-block; padding: 12px 24px; background-color: {{ $branding['primary_color'] }}; color: #ffffff; text-decoration: none; border-radius: 6px; font-size: 15px; font-weight: 600;">Uitnodiging accepteren</a>
+@endsection
diff --git a/api/resources/views/mail/layouts/crewli.blade.php b/api/resources/views/mail/layouts/crewli.blade.php
new file mode 100644
index 00000000..b705d54e
--- /dev/null
+++ b/api/resources/views/mail/layouts/crewli.blade.php
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<html lang="nl">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>@yield('title')</title>
+</head>
+<body style="margin: 0; padding: 0; background-color: #f4f4f5; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;">
+    <table role="presentation" width="100%" cellpadding="0" cellspacing="0" style="background-color: #f4f4f5;">
+        <tr>
+            <td align="center" style="padding: 32px 16px;">
+                <table role="presentation" width="600" cellpadding="0" cellspacing="0" style="max-width: 600px; width: 100%; background-color: #ffffff; border-radius: 8px; overflow: hidden; box-shadow: 0 1px 3px rgba(0,0,0,0.08);">
+                    {{-- Accent line --}}
+                    <tr>
+                        <td style="height: 4px; background-color: {{ $branding['primary_color'] }};"></td>
+                    </tr>
+
+                    {{-- Header: logo + org name --}}
+                    <tr>
+                        <td align="center" style="padding: 32px 40px 24px;">
+                            @if($branding['logo_url'])
+                                <img src="{{ $branding['logo_url'] }}" alt="{{ $branding['organisation_name'] }}" style="max-height: 60px; max-width: 200px; display: block; margin-bottom: 12px;">
+                            @endif
+                            <p style="margin: 0; font-size: 15px; color: #6b7280; font-weight: 500;">{{ $branding['organisation_name'] }}</p>
+                        </td>
+                    </tr>
+
+                    {{-- Body --}}
+                    <tr>
+                        <td style="padding: 0 40px 32px;">
+                            {{-- Title --}}
+                            <h1 style="margin: 0 0 20px; font-size: 22px; font-weight: 700; color: #1f2937; line-height: 1.3;">
+                                @yield('title')
+                            </h1>
+
+                            {{-- Content --}}
+                            <div style="font-size: 16px; color: #1f2937; line-height: 1.6;">
+                                @yield('content')
+                            </div>
+
+                            {{-- Action button --}}
+                            @hasSection('action')
+                                <div style="margin-top: 28px;">
+                                    @yield('action')
+                                </div>
+                            @endif
+                        </td>
+                    </tr>
+
+                    {{-- Footer --}}
+                    <tr>
+                        <td style="padding: 24px 40px; border-top: 1px solid #e5e7eb;">
+                            @if($branding['footer_text'])
+                                <p style="margin: 0 0 16px; font-size: 13px; color: #6b7280; text-align: center; line-height: 1.5;">
+                                    {{ $branding['footer_text'] }}
+                                </p>
+                            @endif
+
+                            <p style="margin: 0; font-size: 11px; color: #9ca3af; text-align: center; line-height: 1.5;">
+                                Powered by Crewli<br>
+                                Je ontvangt deze email omdat je bent aangemeld bij {{ $branding['organisation_name'] }}.
+                            </p>
+                        </td>
+                    </tr>
+                </table>
+            </td>
+        </tr>
+    </table>
+</body>
+</html>
diff --git a/api/resources/views/mail/registration-approved.blade.php b/api/resources/views/mail/registration-approved.blade.php
new file mode 100644
index 00000000..e61e307b
--- /dev/null
+++ b/api/resources/views/mail/registration-approved.blade.php
@@ -0,0 +1,17 @@
+@extends('mail.layouts.crewli')
+
+@section('title')
+    Goed nieuws!
+@endsection
+
+@section('content')
+    <p style="margin: 0 0 16px;">Beste {{ $person->first_name }},</p>
+
+    <p style="margin: 0 0 16px;">Goed nieuws! Je bent goedgekeurd als vrijwilliger voor <strong>{{ $event->name }}</strong>.</p>
+
+    <p style="margin: 0;">Log in op het portaal om je shifts te bekijken en te claimen.</p>
+@endsection
+
+@section('action')
+    <a href="{{ $portalUrl }}" style="display: inline-block; padding: 12px 24px; background-color: {{ $branding['primary_color'] }}; color: #ffffff; text-decoration: none; border-radius: 6px; font-size: 15px; font-weight: 600;">Naar het portaal</a>
+@endsection
diff --git a/api/resources/views/mail/registration-confirmation.blade.php b/api/resources/views/mail/registration-confirmation.blade.php
new file mode 100644
index 00000000..f1475a91
--- /dev/null
+++ b/api/resources/views/mail/registration-confirmation.blade.php
@@ -0,0 +1,24 @@
+@extends('mail.layouts.crewli')
+
+@section('title')
+    Bedankt voor je aanmelding!
+@endsection
+
+@section('content')
+    <p style="margin: 0 0 16px;">Beste {{ $person->first_name }},</p>
+
+    <p style="margin: 0 0 16px;">Bedankt voor je aanmelding als vrijwilliger voor <strong>{{ $event->name }}</strong>!</p>
+
+    <p style="margin: 0 0 16px;">Je registratie wordt beoordeeld door de organisatie. Je ontvangt een e-mail zodra je aanmelding is verwerkt.</p>
+
+    <p style="margin: 0 0 16px;">Je kunt inloggen op het vrijwilligersportaal om je status te volgen.</p>
+
+    <p style="margin: 0;">
+        <strong>Evenement:</strong> {{ $event->name }}<br>
+        <strong>Datum:</strong> {{ $event->start_date->format('d-m-Y') }} t/m {{ $event->end_date->format('d-m-Y') }}
+    </p>
+@endsection
+
+@section('action')
+    <a href="{{ $portalUrl }}" style="display: inline-block; padding: 12px 24px; background-color: {{ $branding['primary_color'] }}; color: #ffffff; text-decoration: none; border-radius: 6px; font-size: 15px; font-weight: 600;">Naar het portaal</a>
+@endsection
diff --git a/api/resources/views/mail/registration-rejected.blade.php b/api/resources/views/mail/registration-rejected.blade.php
new file mode 100644
index 00000000..b8ba5d47
--- /dev/null
+++ b/api/resources/views/mail/registration-rejected.blade.php
@@ -0,0 +1,17 @@
+@extends('mail.layouts.crewli')
+
+@section('title')
+    Update over je aanmelding
+@endsection
+
+@section('content')
+    <p style="margin: 0 0 16px;">Beste {{ $person->first_name }},</p>
+
+    <p style="margin: 0 0 16px;">Helaas hebben we je aanmelding voor <strong>{{ $event->name }}</strong> niet kunnen goedkeuren.</p>
+
+    @if($reason)
+        <p style="margin: 0 0 16px;"><strong>Reden:</strong> {{ $reason }}</p>
+    @endif
+
+    <p style="margin: 0;">Neem contact op met de organisatie als je vragen hebt.</p>
+@endsection
diff --git a/api/routes/web.php b/api/routes/web.php
new file mode 100644
index 00000000..bb191bbb
--- /dev/null
+++ b/api/routes/web.php
@@ -0,0 +1,27 @@
+<?php
+
+use App\Mail\InvitationMail;
+use App\Mail\RegistrationApprovedMail;
+use App\Mail\RegistrationConfirmationMail;
+use App\Mail\RegistrationRejectedMail;
+use App\Models\Event;
+use App\Models\Organisation;
+use App\Models\Person;
+use App\Models\UserInvitation;
+use Illuminate\Support\Facades\Route;
+
+if (app()->environment('local', 'staging')) {
+    Route::get('/mail-preview/{type}', function (string $type) {
+        $org = Organisation::first();
+        $event = Event::first();
+        $person = Person::first();
+
+        return match ($type) {
+            'registration-confirmation' => new RegistrationConfirmationMail($person, $event),
+            'registration-approved' => new RegistrationApprovedMail($person, $event),
+            'registration-rejected' => new RegistrationRejectedMail($person, $event, 'Helaas geen plek meer.'),
+            'invitation' => new InvitationMail(UserInvitation::first()),
+            default => abort(404),
+        };
+    });
+}
diff --git a/api/tests/Feature/Mail/MailBrandingServiceTest.php b/api/tests/Feature/Mail/MailBrandingServiceTest.php
new file mode 100644
index 00000000..cb5d1a07
--- /dev/null
+++ b/api/tests/Feature/Mail/MailBrandingServiceTest.php
@@ -0,0 +1,90 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature\Mail;
+
+use App\Models\Organisation;
+use App\Services\MailBrandingService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class MailBrandingServiceTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private MailBrandingService $service;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->service = new MailBrandingService();
+    }
+
+    public function test_returns_org_branding_when_configured(): void
+    {
+        $org = Organisation::factory()->create([
+            'name' => 'Festival BV',
+            'email_logo_url' => 'https://example.com/logo.png',
+            'email_primary_color' => '#ff5500',
+            'email_reply_to' => 'info@festival.nl',
+            'email_sender_name' => 'Festival Team',
+            'email_footer_text' => 'Stichting Festival, Amsterdam',
+        ]);
+
+        $branding = $this->service->getBranding($org);
+
+        $this->assertEquals('Festival BV', $branding['organisation_name']);
+        $this->assertEquals('https://example.com/logo.png', $branding['logo_url']);
+        $this->assertEquals('#ff5500', $branding['primary_color']);
+        $this->assertEquals('info@festival.nl', $branding['reply_to']);
+        $this->assertEquals('Festival Team', $branding['sender_name']);
+        $this->assertEquals('Stichting Festival, Amsterdam', $branding['footer_text']);
+    }
+
+    public function test_falls_back_to_defaults_when_not_configured(): void
+    {
+        $org = Organisation::factory()->create([
+            'name' => 'Lege Org',
+            'email_logo_url' => null,
+            'email_primary_color' => null,
+            'email_reply_to' => null,
+            'email_sender_name' => null,
+            'email_footer_text' => null,
+        ]);
+
+        $branding = $this->service->getBranding($org);
+
+        $this->assertEquals('Lege Org', $branding['organisation_name']);
+        $this->assertNull($branding['logo_url']);
+        $this->assertEquals('#6366f1', $branding['primary_color']);
+        $this->assertNull($branding['reply_to']);
+        $this->assertEquals('Lege Org', $branding['sender_name']);
+        $this->assertNull($branding['footer_text']);
+    }
+
+    public function test_sender_name_falls_back_to_org_name(): void
+    {
+        $org = Organisation::factory()->create([
+            'name' => 'Mijn Organisatie',
+            'email_sender_name' => null,
+        ]);
+
+        $branding = $this->service->getBranding($org);
+
+        $this->assertEquals('Mijn Organisatie', $branding['sender_name']);
+    }
+
+    public function test_logo_url_falls_back_to_config_default(): void
+    {
+        config(['crewli.default_logo_url' => 'https://crewli.app/logo.png']);
+
+        $org = Organisation::factory()->create([
+            'email_logo_url' => null,
+        ]);
+
+        $branding = $this->service->getBranding($org);
+
+        $this->assertEquals('https://crewli.app/logo.png', $branding['logo_url']);
+    }
+}
diff --git a/api/tests/Feature/Mail/MailLayoutTest.php b/api/tests/Feature/Mail/MailLayoutTest.php
new file mode 100644
index 00000000..37abd71d
--- /dev/null
+++ b/api/tests/Feature/Mail/MailLayoutTest.php
@@ -0,0 +1,157 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature\Mail;
+
+use App\Mail\CrewliMailable;
+use App\Mail\InvitationMail;
+use App\Mail\RegistrationApprovedMail;
+use App\Mail\RegistrationConfirmationMail;
+use App\Mail\RegistrationRejectedMail;
+use App\Models\CrowdType;
+use App\Models\Event;
+use App\Models\Organisation;
+use App\Models\Person;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+class MailLayoutTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private Organisation $organisation;
+    private Event $event;
+    private Person $person;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->organisation = Organisation::factory()->create([
+            'name' => 'Test Festival BV',
+            'email_logo_url' => 'https://example.com/logo.png',
+            'email_primary_color' => '#e11d48',
+            'email_footer_text' => 'Stichting Test Festival, Utrecht',
+        ]);
+
+        $this->event = Event::factory()->create([
+            'organisation_id' => $this->organisation->id,
+            'status' => 'registration_open',
+        ]);
+
+        $crowdType = CrowdType::factory()->systemType('VOLUNTEER')->create([
+            'organisation_id' => $this->organisation->id,
+        ]);
+
+        $this->person = Person::factory()->create([
+            'event_id' => $this->event->id,
+            'crowd_type_id' => $crowdType->id,
+            'first_name' => 'Jan',
+            'last_name' => 'Tester',
+            'email' => 'jan@test.nl',
+        ]);
+    }
+
+    public function test_confirmation_email_renders_with_org_logo(): void
+    {
+        $mail = new RegistrationConfirmationMail($this->person, $this->event);
+        $html = $mail->render();
+
+        $this->assertStringContainsString('https://example.com/logo.png', $html);
+        $this->assertStringContainsString('Test Festival BV', $html);
+    }
+
+    public function test_confirmation_email_renders_with_primary_color(): void
+    {
+        $mail = new RegistrationConfirmationMail($this->person, $this->event);
+        $html = $mail->render();
+
+        $this->assertStringContainsString('#e11d48', $html);
+    }
+
+    public function test_confirmation_email_renders_with_custom_footer(): void
+    {
+        $mail = new RegistrationConfirmationMail($this->person, $this->event);
+        $html = $mail->render();
+
+        $this->assertStringContainsString('Stichting Test Festival, Utrecht', $html);
+    }
+
+    public function test_confirmation_email_renders_with_defaults_when_no_branding(): void
+    {
+        $plainOrg = Organisation::factory()->create([
+            'name' => 'Plain Org',
+            'email_logo_url' => null,
+            'email_primary_color' => null,
+            'email_footer_text' => null,
+        ]);
+
+        $event = Event::factory()->create([
+            'organisation_id' => $plainOrg->id,
+            'status' => 'registration_open',
+        ]);
+
+        $crowdType = CrowdType::factory()->systemType('VOLUNTEER')->create([
+            'organisation_id' => $plainOrg->id,
+        ]);
+
+        $person = Person::factory()->create([
+            'event_id' => $event->id,
+            'crowd_type_id' => $crowdType->id,
+        ]);
+
+        $mail = new RegistrationConfirmationMail($person, $event);
+        $html = $mail->render();
+
+        // Default primary color
+        $this->assertStringContainsString('#6366f1', $html);
+        // Org name is shown
+        $this->assertStringContainsString('Plain Org', $html);
+        // Powered by Crewli always present
+        $this->assertStringContainsString('Powered by Crewli', $html);
+    }
+
+    public function test_approved_email_renders_with_branding(): void
+    {
+        $mail = new RegistrationApprovedMail($this->person, $this->event);
+        $html = $mail->render();
+
+        $this->assertStringContainsString('https://example.com/logo.png', $html);
+        $this->assertStringContainsString('#e11d48', $html);
+        $this->assertStringContainsString('Goed nieuws', $html);
+    }
+
+    public function test_rejected_email_renders_with_reason(): void
+    {
+        $mail = new RegistrationRejectedMail($this->person, $this->event, 'Geen plek meer.');
+        $html = $mail->render();
+
+        $this->assertStringContainsString('Geen plek meer.', $html);
+        $this->assertStringContainsString('Test Festival BV', $html);
+    }
+
+    public function test_rejected_email_renders_without_reason(): void
+    {
+        $mail = new RegistrationRejectedMail($this->person, $this->event);
+        $html = $mail->render();
+
+        $this->assertStringNotContainsString('Reden:', $html);
+    }
+
+    public function test_all_mailables_extend_crewli_mailable(): void
+    {
+        $this->assertInstanceOf(CrewliMailable::class, new RegistrationConfirmationMail($this->person, $this->event));
+        $this->assertInstanceOf(CrewliMailable::class, new RegistrationApprovedMail($this->person, $this->event));
+        $this->assertInstanceOf(CrewliMailable::class, new RegistrationRejectedMail($this->person, $this->event));
+    }
+
+    public function test_powered_by_crewli_always_present(): void
+    {
+        $mail = new RegistrationConfirmationMail($this->person, $this->event);
+        $html = $mail->render();
+
+        $this->assertStringContainsString('Powered by Crewli', $html);
+        $this->assertStringContainsString('Je ontvangt deze email omdat je bent aangemeld bij', $html);
+    }
+}
diff --git a/api/tests/Feature/Organisation/OrganisationEmailBrandingTest.php b/api/tests/Feature/Organisation/OrganisationEmailBrandingTest.php
new file mode 100644
index 00000000..f035ef79
--- /dev/null
+++ b/api/tests/Feature/Organisation/OrganisationEmailBrandingTest.php
@@ -0,0 +1,138 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature\Organisation;
+
+use App\Models\Organisation;
+use App\Models\User;
+use Database\Seeders\RoleSeeder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Laravel\Sanctum\Sanctum;
+use Tests\TestCase;
+
+class OrganisationEmailBrandingTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private User $orgAdmin;
+    private Organisation $organisation;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->seed(RoleSeeder::class);
+
+        $this->organisation = Organisation::factory()->create();
+        $this->orgAdmin = User::factory()->create();
+        $this->organisation->users()->attach($this->orgAdmin, ['role' => 'org_admin']);
+    }
+
+    public function test_update_organisation_with_email_branding(): void
+    {
+        Sanctum::actingAs($this->orgAdmin);
+
+        $response = $this->putJson("/api/v1/organisations/{$this->organisation->id}", [
+            'email_logo_url' => 'https://example.com/logo.png',
+            'email_primary_color' => '#ff5500',
+            'email_reply_to' => 'info@festival.nl',
+            'email_sender_name' => 'Festival Team',
+            'email_footer_text' => 'Stichting Festival, Amsterdam',
+        ]);
+
+        $response->assertOk();
+
+        $this->assertDatabaseHas('organisations', [
+            'id' => $this->organisation->id,
+            'email_logo_url' => 'https://example.com/logo.png',
+            'email_primary_color' => '#ff5500',
+            'email_reply_to' => 'info@festival.nl',
+            'email_sender_name' => 'Festival Team',
+            'email_footer_text' => 'Stichting Festival, Amsterdam',
+        ]);
+    }
+
+    public function test_validate_email_primary_color_hex_format(): void
+    {
+        Sanctum::actingAs($this->orgAdmin);
+
+        $response = $this->putJson("/api/v1/organisations/{$this->organisation->id}", [
+            'email_primary_color' => 'red',
+        ]);
+
+        $response->assertUnprocessable()
+            ->assertJsonValidationErrors('email_primary_color');
+    }
+
+    public function test_validate_email_primary_color_accepts_valid_hex(): void
+    {
+        Sanctum::actingAs($this->orgAdmin);
+
+        $response = $this->putJson("/api/v1/organisations/{$this->organisation->id}", [
+            'email_primary_color' => '#aaBB11',
+        ]);
+
+        $response->assertOk();
+    }
+
+    public function test_validate_email_reply_to_format(): void
+    {
+        Sanctum::actingAs($this->orgAdmin);
+
+        $response = $this->putJson("/api/v1/organisations/{$this->organisation->id}", [
+            'email_reply_to' => 'not-an-email',
+        ]);
+
+        $response->assertUnprocessable()
+            ->assertJsonValidationErrors('email_reply_to');
+    }
+
+    public function test_validate_email_logo_url_format(): void
+    {
+        Sanctum::actingAs($this->orgAdmin);
+
+        $response = $this->putJson("/api/v1/organisations/{$this->organisation->id}", [
+            'email_logo_url' => 'not-a-url',
+        ]);
+
+        $response->assertUnprocessable()
+            ->assertJsonValidationErrors('email_logo_url');
+    }
+
+    public function test_organisation_resource_includes_branding_fields(): void
+    {
+        $this->organisation->update([
+            'email_logo_url' => 'https://example.com/logo.png',
+            'email_primary_color' => '#ff5500',
+            'email_reply_to' => 'info@festival.nl',
+            'email_sender_name' => 'Festival Team',
+            'email_footer_text' => 'Voetje tekst',
+        ]);
+
+        Sanctum::actingAs($this->orgAdmin);
+
+        $response = $this->getJson("/api/v1/organisations/{$this->organisation->id}");
+
+        $response->assertOk()
+            ->assertJsonPath('data.email_logo_url', 'https://example.com/logo.png')
+            ->assertJsonPath('data.email_primary_color', '#ff5500')
+            ->assertJsonPath('data.email_reply_to', 'info@festival.nl')
+            ->assertJsonPath('data.email_sender_name', 'Festival Team')
+            ->assertJsonPath('data.email_footer_text', 'Voetje tekst');
+    }
+
+    public function test_branding_fields_nullable(): void
+    {
+        Sanctum::actingAs($this->orgAdmin);
+
+        $response = $this->putJson("/api/v1/organisations/{$this->organisation->id}", [
+            'email_logo_url' => null,
+            'email_primary_color' => null,
+            'email_reply_to' => null,
+            'email_sender_name' => null,
+            'email_footer_text' => null,
+        ]);
+
+        $response->assertOk();
+    }
+}