Posthorn, self-hosted mail without the mail server
Routes Ghost and Gitea email through one transactional provider to bypass VPS SMTP blocks.

Self-hosted email privacy with permanent remote content inlining, not expiring proxy caches.
Self-hosted email administrators, privacy-conscious users
ProtonMail · Mailvelope · gpgit
Routes Ghost and Gitea email through one transactional provider to bypass VPS SMTP blocks.
The repo delivers the two UX pieces you actually need: a visual rule builder plus a raw SIEVE editor and an IMAP connection dialog for direct uploads. It’s pragmatic — cross-compile notes, native build deps, and a tuned release profile (strip, LTO, size opt) show the author cared about distribution and binary size — but it’s solving a narrow, well-known problem rather than inventing one.
Cleaner UI than 10minutemail, but mail.tm already exists and has a free web app.
Clean temp mail UI, but 10minutemail, Guerrilla Mail, and Tempmail already own this space.
Zero third-party email service, fuzzy variable mapping, preview-before-send, but Zapier+SendGrid solves this.
93% token reduction via deterministic sanitization instead of trusting raw web content.