* notification when somebody creates a mailbox (enabled by env var) * reserved mailboxes (enabled by env var) * CC/BCC support, including multi-domain setups and thread replies * SPF and DKIM validation (enabled by mailbox owners) * removal of CSS in HTML part of incoming emails (the famous `@font-face`) * section titles in `!pm help` * do not react to edits and redactions * reject impersonations while using postmoogle as SMTP server from your own scripts * parallelize MX, SPF, SMTP, spamlist validations * healthchecks.io integration * trusted proxies * big refactoring