How to configure mailhelo for Exim

Introduction

This article provides the procedure to configure mailhelo for Exim.

Procedure

1. Log into 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.

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

   Please 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.

Additional resources

How to Configure the Exim Outgoing IP Address