How to configure mailhelo for Exim

Question

How do you configure mailhelo for Exim?

Answer

1. Log in to WHM as the ‘root’ user.
2. Navigate to Home / Exim / Configuration Manager.
3. Click the Domains and IPs tab.
4. Set the Use the reverse DNS entry for the mail HELO/EHLO if available option to Off.
5. Set the Reference /etc/mailhelo for custom outgoing SMTP HELO option to On.
6. Click the Save button.
7. Access the server's command line as the 'root' user via SSH or Terminal in WHM.
8. Open the /etc/mailhelo file in your preferred text editor.

9. Add the desired entries to the file:

   CONFIG_TEXT: domain.tld: mail.domain.tld
   *: hostname.domain.tld

   Note: "domain.tld", "mail.domain.tld", and "hostname.domain.tld" must be replaced with the email domain, the HELO hostname response for the domain, and the server's hostname, respectively.

10. Save the changes and exit the text editor.

11. Restart Exim:

    # /scripts/restartsrv_exim

Additional resources

How to Configure the Exim Outgoing IP Address