Requirements
To use Fastmail with Postbox you must have:
- a paid account, or if you are on trial, an account verified by phone number
- an app password, see Fastmail's app password setup guide.
Here are the settings to use:
Incoming Server
Account Type: IMAP
Incoming Server: imap.fastmail.com
Port: 993
User Name: [your account]@fastmail.com
Connection Security: SSL/TLS
Authentication: Password
Outgoing Server
Server Name: smtp.fastmail.com
Port: 465
User Name: [your account]@fastmail.com
Connection Security: SSL/TLS
Authentication: Password