The instructions and screenshots in this setup guide are for Windows Phone 8. Previous versions of Windows Phone are very similar, although the screenshots may not match exactly what you see on your device.
Open the Settings app.
Tap email + accounts.
Tap add an account.
Tap other account.
Fill in your email address and password:
Your FastMail account is now ready to use.
If this doesn't work, you may need to explicitly enter in the mail server name and port using the Advanced Settings. To explicitly set a port number in the outgoing or incoming server settings, use the format