Most email integrations read. This one also sends, files, archives and reorganises the mailboxes themselves, with the identity you reply from as an explicit choice — and contacts, calendar and files arrive over the same connection once the app password is in place.
A Fastmail client with a full write surface: it can send email, delete messages and modify contacts and calendars on your behalf. Mail and contacts go over JMAP with the API token alone; calendars over CalDAV and file storage over WebDAV are registered only when an app password is also present.
- Email sent, replied to, moved, archived, pinned and deleted
- Search across messages, and across snippets when you only remember a phrase
- A whole thread read at once, and an individual message parsed
- Mailboxes listed, created, renamed and deleted
- Labels managed and read state set on a message
- Messages imported and exported
- Identities listed and set, so a reply leaves from the right address
- A health check on the connection
- Contacts over JMAP, plus calendars and file storage once the app password is supplied
A Fastmail API token with the JMAP contacts capability enabled, as FASTMAIL_API_TOKEN, plus FASTMAIL_EMAIL. Calendars and files additionally need an app password with the DAV scope, as FASTMAIL_APP_PASSWORD. Install with pip install pyfastmail-mcp or run it under uvx.
One command plus a key — pip install pyfastmail-mcp, then supply credentials