What are my Fastmail IMAP settings?

IMAP is imap.fastmail.com on port 993 (SSL); SMTP is smtp.fastmail.com on port 465. Filled in automatically.

Why does Fastmail require an app password?

Fastmail does not accept your account password over IMAP for security. Generate an app password at app.fastmail.com/settings/security/devicekeys, which is scoped and revocable.

Does Fastmail calendar work?

Yes. Fastmail’s CalDAV is auto-discovered, enabling list and create-event tools.

Connect your Fastmail email to Claude & ChatGPT

Fastmail is IMAP with excellent CalDAV. It requires an app password for any third-party client, since your account password simply won't work, and anymailmcp.com follows that rule.

Get started Setup guide

Server settings (auto-detected)

IMAP: imap.fastmail.com:993
SMTP: smtp.fastmail.com:465
Encryption: SSL/TLS

Calendar: yes

Fastmail has first-class CalDAV. We discover your calendars on connect so your assistant can read and create events.

Before you start

What you need

Your Fastmail email address

Your full Fastmail address.

An app password (required)

Fastmail blocks your main password for IMAP. Create an app password under Settings → Privacy & Security → App passwords and paste it here.

Fastmail works best with a revocable app password.

Generate an app password

Set it up in your AI

Your Fastmail inbox, inside your assistant

Read and triage your Fastmail mail, draft replies and manage your calendar, straight from the chat you already use. It takes about a minute to connect.

Open Settings → Connectors in Claude Desktop or claude.ai.
Click Add custom connector and paste the URL below.
Click Connect, then sign in with your email (we send you a magic link). You add your mailbox from your profile afterwards.

https://anymailmcp.com/mcp