IMAP Migrator
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Fastmail IMAP, POP3 and SMTP settings

To set up Fastmail in a mail app, use IMAP server imap.fastmail.com on port 993 with SSL/TLS, and SMTP server smtp.fastmail.com on port 465 (SSL/TLS).

ProtocolServerPortSecurity
IMAPimap.fastmail.com993SSL/TLS
POP3pop.fastmail.com995SSL/TLS
SMTPsmtp.fastmail.com465SSL/TLS

Sign-in

Full email address and an app password.

Questions

What is the Fastmail IMAP server?

imap.fastmail.com, port 993, SSL/TLS.

What is the Fastmail SMTP server?

smtp.fastmail.com:465 (SSL/TLS)

Which password do I use?

Full email address and an app password.

Moving mail to or from Fastmail? Copy every folder server to server.See migration guides

Settings can change: if a connection fails, check the provider's help pages or run the IMAP connection test.