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Postern tagged v1.0.0 on July 9, 2026: the first production-ready release of the self-hostable Cloudflare mailbox for humans and agents. Notes on what the tag means, the five-week path from send-only cf-email-relay to a full store with webmail and IMAP, the acceptance smoke that gates the release, and the honest cost of making real mail clients happy.
Postern replaces our retired send-only cf-email-relay with a full mailbox: inbound via Email Routing, outbound via Email Sending, D1 and R2 storage, FTS and optional semantic search, webmail and read-only IMAP, a Go SMTP relay for legacy callers, and one structured API that agents and humans both use.