Fix Apple Mail Cannot send message using the server SMTP AUTH required

Problem

When you send an email from Apple Mail on MacOS (Macbook, Macbook Pro, iMac, Mac mini) the following error can occur:

Cannot send message using the server info@example.com – The server response was: SMTP AUTH is required for message submission on port 587

Symptoms

• You are using Apple Mail on your Mac
• You cannot send emails
• Receiving emails works fine.

Causes

• Incorrect SMTP settings

Resolution

1. Click Edit SMTP Server List on the error message.
   
2. Uncheck Automatically manage connection settings.
   
3. Check Port is set to 587 and Use TLS/SSL is checked.
   
4. Click the Authentication drop-down list and select Password.
   
5. Double-check your SMTP settings and then click OK.
   • Username: Your Ecenica email address. E.g. info@example.com
   • Password: Your email address password
   • Host Name: mail.example.com, replacing example.com with your domain name.
   • Port: 587
   • Use TLS/SSL: Checked.
   • Authentication: Password