cPanel and WHM Configuration for Mail Assure

The following instructions describe how to:

  • Restrict incoming delivery to Mail Assure only
  • Disable catchall behaviour
  • Route outgoing mail through Mail Assure



As the root user:

  1. Set the Service configuration > Exim Configuration Manager > Access lists to Only-verify-recipient to contain:

  2. In the Service configuration > Exim Configuration Manager > ACL options set:
    • Ratelimit suspicious SMTP servers > False
    • Ratelimit incoming connections with only failed recipients > False
  3. In Server configuration > Tweak settings > Mail set:
    • Email delivery retry time > 5 minutes
    • Initial default/catch-all forwarder destination > Fail
    • Enable BoxTrapper spam trap > Off
    • Enable Apache SpamAssassin™ spam filter > On
  4. In Email > Spamd startup configuration > Allowed IPs set:

    This will restrict the server from receiving mail for all domains to only accepting mail from Mail Assure.

In cPanel

As the admin for the domain, or higher:

Select Email > Default Address > <domain> > Discard the email while your server processes it by SMTP time with an error message.



In Service configuration > Exim Configuration Manager > Mail set:

  • Smarthost support > *

This should be <asterisk><space><smarthost address><double colon><port number>.