Documentation
Setup guides, deployment runbooks, and operational reference.
documentation
Backup and restore
Deliverability
Deploy Coldfeet behind Cloudflare (Full SSL)
Origin TLS with Certbot (Let's Encrypt)
Feature matrix (operator QA)
Provider inbound MX
Install Coldfeet on Ubuntu 24.04 LTS
Rotating the encryption key
ESP relay accounts (SES, SendGrid, Mailgun, Resend, Postmark, MailerSend)
Outbound: routing customer mail through Coldfeet
Worker cutover: remove Postfix / local_mta
Ops cleanup after relay / inbound unblock (2026-08-05)