DirectAdmin email issues and solutions.

The service ‘exim’ on server xxx is currently down [Follow this]

SMTP Error (-1): Connection to server failed.

1. Check SSL certificate
2. Check email server

   service postfix status

   Unit postfix.service could not be found? Restart postfix

   service postfix restart

3. Failed to restart postfix.service: Unit postfix.service not found. [Follow this]