Mac Email - Change Port

To change your iPhone or iPad SMTP port settings
  1. Open the Settings app.
  2. On the Settings screen, tap the Accounts & Password option.
  3. Tap the email account you want to change.
  4. Tap the Account
  5. Tap SMTP and select the SMTP server you want to modify.
  6. If you have Use SSL turned on, use port 465. Otherwise turn Use SSL off, and try these other ports for SMTP: 80, 3535, or 25.
  7. Go to Mail, and check to see if you can send email. If not, repeat steps 1-5 and try a different port.

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