What Are the FastMail SMTP Settings?

by Heinz Tschabitscher
An independent writer who has reviewed hundreds of email programs and services since 1997.
Updated April 11, 2018

Looking for the FastMail SMTP server settings for sending mail? We have them!

The FastMail SMTP server settings for sending mail through FastMail from any email program are:

  • FastMail SMTP server address: mail.messagingengine.com
  • FastMail SMTP user name: Your full FastMail email address (including "@fastmail.fm", for instance, or your specific domain name)
  • FastMail SMTP password: Your FastMail password
  • FastMail SMTP port: 465 (alternative: 587)
  • FastMail SMTP TLS/SSL required: yes (with port 587: no)
  • FastMail SMTP STARTTLS required: no (with port 587: yes)

Note that FastMail SMTP does not work with legacy guest and member accounts; use your ISP's or a different free email service's SMTP server in this case.

To download mail from FastMail to your email program, see the