Email, Messaging, & Video Calls Email What Are the FastMail SMTP Server Settings? The FastMail server settings for sending email By Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated April 12, 2019 FastMail Email Yahoo! Mail Gmail Tweet Share Email 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.comFastMail SMTP user name: Your full FastMail email address (including "@fastmail.fm", for instance, or your specific domain name)FastMail SMTP password: Your FastMail passwordFastMail SMTP port: 465 (alternative: 587)FastMail SMTP TLS/SSL required: yes (with port 587: no)FastMail SMTP STARTTLS required: no (with port 587: yes) 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.