- Open Mail.app.
- Go to Mail > Preferences
- Click Accounts > Account Information
- Under Account Information look for Outgoing Mail Server (SMTP).
- Click on the drop down arrow and select Edit Server List...
- Select the existing SMTP server for your domain.
- Click Advanced and change the server port to "Use Custom Port" and enter 465.
- From the Authentication drop down, select Password
- Fill in your Username (e.g. [email protected]) and Password
- Click the Test Account Settings button to set the new settings.
- Click OK and then close the preferences window.
- Click Next then Finish.
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