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feat(cli): add mock SMTP server for testing scaletest notifications#20221

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feat(cli): add mock SMTP server for testing scaletest notifications#20221

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kacpersaw commentedOct 8, 2025•
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This PR adds a fake SMTP server for scale testing. It collects emails sent during tests, which you can then check using the HTTP API.

Changes

Added mock SMTP server
Addedcoder scaletest smtp CLI command
Implemented HTTP API endpoints to retrieve messages by email
Added auto-purge to prevent memory issues

HTTP API Endpoints

GET /messages?email=<email> – Get messages sent to an email address
POST /purge – Clear all messages from memory

The HTTP API parses raw email messages to extract thedate,subject, andnotification ID.

Notification IDs are sent in emails like this:

<p><ahref="http://127.0.0.1:3000/settings/notifications?disabled=4e19c0ac-94e1-4532-9515-d1801aa283b2"style="color: #2563eb; text-decoration: none;">    Stop receiving emails like this</a></p>

CLI

coder scaletest smtp --host localhost --port 33199 --api-port 8080 --purge-at-count 1000

Flags:

--host: Host for the mock SMTP and API server (default: localhost)
--port: Port for the mock SMTP server (random if not specified)
--api-port: Port for the HTTP API server (random if not specified)
--purge-at-count: Max number of messages before auto-purging (default: 100000)