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  1. Modify the rDNS for each IPv4 address to point to the desired domain.

    Warning
    titleImportant:


  2. Enable the Send mail from account's dedicated IP address option in WHM's Exim Configuration Manager interface ( Home >> Service Configuration >> Exim Configuration Manager ).

    Warning
    titleWarning:

    If you select this option, cPanel & WHM uses the /usr/local/cpanel/scripts/updateuserdomains script to automatically configure Exim, and overrides any manual changes in the following files:

      • /etc/mailhelo
      • /etc/mailips


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To use a custom Exim configuration, you must enable the following options in the Basic Editor section of WHM's Exim Configuration Manager interface (Home >> Service Configuration >> Exim Configuration Manager):

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Warning
titleImportant:
  • If you disable the Reference /etc/mailhelo for outgoing SMTP HELO setting, the system willoverwrite any changes that you make to the /etc/mailhelo file.
  • If you disable the Reference /etc/mailips for outgoing SMTP connections setting, the system will overwrite any changes that you make to the /etc/mailips file.

If you change the outgoing IP address to a non-cPanel main IP address, the cPanel user must update that email address' SPF record. They can configure the SPF record in cPanel's Email Deliverability interface (cPanel >> Home >> Email >> Email Deliverability).

Note

In cPanel & WHM version 76 and earlier, this interface is cPanel's Authentication interface (cPanel >> Home >> Email >> Authentication).


The /etc/mailhelo file

The /etc/mailhelo file contains Exim's configuration for the HELO command, which initiates dialog between a mail server and a client. This file governs which domain sends the HELO command.

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