Mac Mail Yosemite account settings: disable "Automatically detect and maintain settings"
If you are running Yosemite you may want to change two options to make sure that your account settings don't change. These steps only apply to apple computers running Yosemite and later Mac OS.
- Choose Preferences, from the Mail menu.
- The Mail Menu
- Select Preferences.
- Click on the Accounts tab.
- Click on Advanced.
- Uncheck the option labeled "Automatically detect and maintain settings".
- Now Click on Account Information
- Under Outgoing Mail Server(SMTP) select the "Edit SMTP Server List" option.
- Click Advanced.
- Uncheck the option labeled "Automatically detect and maintain settings"