Mail OS X Yosemite troubleshooting
♦ Is this the first time you’re setting up this email account? Then use our new email setup guide, rather than this troubleshooting guide.
Check account settings
Note: replace example.com with your domain name
- Launch Mail
- Choose Mail > Preferences

Account settings
3. Choose the relevant account from the list on the left, and ensure that the Account Information is correct, specifically:
- Account Type can be IMAP or POP
- Incoming Mail Server is mail.(your domain name) (or the specific server name or IP address of the domain)
- User Name is the full email address
- Password is correct – forgotten passwords can be reset in konsoleH

SMTP Server settings
4. At Outgoing Mail Server (SMTP) click on the dropdown arrow and choose Edit SMTP Server list
5. On the Account Information tab ensure that:
- Server Name is smtp.domain (or the specific server name or IP address of the domain)
- TLS Certificate is None

6. Click on the Advanced tab, choose the relevant account and ensure that:
- Automatically detect and maintain account settings is not ticked
- Port is 587
- Use SSL is not ticked
- Allow insecure authentication is ticked
- User Name is the full email address
- > OK

Incoming Mail Server settings
7. Back on the Accounts screen, click on the Advanced tab and ensure that the Incoming Server settings are correct, specifically:
- Automatically detect and maintain account settings is not ticked
- Port is 143 for IMAP (or 110 for POP)
- Use SSL is not ticked
- Authentication is set to Password
- Allow insecure authentication is ticked

Finish
8. Click outside of that screen and Save settings when prompted on closing.
Your Yosemite Mail account is now setup correctly.