Use Fastmail in Your Favorite Email App

Easily send and receive messages using a desktop email app such as Postbox, Apple Mail, or Thunderbird. Using a desktop email app lets you view all your accounts in one place, work more efficiently, and access email when you're offline.

Email Settings for Fastmail

Incoming Server – IMAP

Server: imap.fastmail.com
Port: 993
Security: SSL/TLS
Username: Your full email address
Password: Your password

Outgoing Server – SMTP

Server: smtp.fastmail.com
Port: 465
Security: SSL/TLS
Username: Your full email address
Password: Your password

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macOS + Windows