1. Click on the Mail menu then select Preferences.
2. Select the Accounts tab then select the email account to update.
3. On the account information tab, you can change:
- Incoming Mail Server
to change the Outgoing server Mail settings:
4. At the bottom where it says Outgoing Mail Server SMTP Select Edit smtp server list from the drop down menu.5. Select your outgoing mail server from the list at the top of the screen
6. Change the server name
7. Save your changes
Close the window and Save when prompted.