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SSL/TLS Encryption: Enabled (but not STARTTLS)
Authentication: PLAIN (Our SMTP ports are for authenticated SMTP only; you'll need to make sure your software supports authenticated SMTP and also set up a username and password)
Username: your FastMail username/login name/email address (must include @fastmail.fm part)
Password: your FastMail password
Alternatively, if you're client supports STARTTLS only, you can use port 587 with STARTTLS enabled.
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