Sinkhole for Laravel

A Laravel mail transport that sends all outgoing email to a Sinkhole instance — a Cloudflare Worker email trap with a web UI.

Use it in staging or local development to capture emails without delivering them to real inboxes.

Requirements

• PHP 8.1+
• Laravel 10, 11, or 12

Installation

composer require frontier-sh/sinkhole

The service provider is auto-registered via Laravel's package discovery.

Configuration

Add the transport to config/mail.php:

'mailers' => [
    // ...

    'sinkhole' => [
        'transport' => 'sinkhole',
        'endpoint'  => env('SINKHOLE_ENDPOINT'),
        'api_key'   => env('SINKHOLE_API_KEY'),
        'channel'   => env('SINKHOLE_CHANNEL', 'default'),
    ],
],

Set your environment variables:

MAIL_MAILER=sinkhole
SINKHOLE_ENDPOINT=https://your-worker.workers.dev
SINKHOLE_API_KEY=your-api-key
SINKHOLE_CHANNEL=staging

What gets captured

• To, From, Subject
• HTML and plain text bodies
• All email headers
• Attachments (base64-encoded, stored in R2)
• Custom headers like X-Tag and X-Metadata-* are displayed in the Sinkhole UI

License

MIT