Troubleshoot Errors in macOS Sierra Mail Setup

User Name : name@example.com
Your user name is your full email address
Incoming Server : mail.example.com
Ports : IMAP 143 / POP 110
Outgoing Server : smtp.example.com
Port : SMTP 587

Yosemite-Mail-logo

This guide will help you fix errors in the setup of an email account in macOS Sierra Mail.

Is this the first time you’re setting up this email account? Then use our macOS Sierra setup guide, rather than this troubleshooting guide.

Change example.com to your domain name

Check account settings

  1. From the top menu choose Mail > Preferences…preferences

    Account Information

  2. On the Accounts tab, choose the relevant account from the list on the left, and check:
    • Enable this account is checked
    • Download attachments is set according to your preference
  3. Click Server Settingskh-sierra-accounts

    Server Settings

  4. Check:

    Important

  5. Deselect (uncheck) the boxes for Automatically manage connection settings for both Incoming and Outgoing Mail Servers – additional fields will now be displayed.
  6. Select Advanced IMAP Settingssierra-advanced-imap
  7. Select Allow insecure authentication > OK kh-sierra-advanced-imap
  8. Deselect (uncheck) the boxes for Use TSL/SSL for both Incoming and Outgoing Mail Servers.
  9. Under Outgoing Mail Server (SMTP) click the dropdown arrow at Account
  10. Select Edit SMTP Server List          
  11. Make sure that Allow insecure authentication is ticked 
  12. Click OK and Save. (Note: this button only becomes visible when settings have changed)Your macOS Sierra mail is now setup correctly.

Still struggling? Refer to our guide of common email problems or contact support@hetzner.co.za.