How to automatically update the Mail Exchange entries for all domains

Question

How do I automatically update the Remote or Local Mail Exchange entries for all domains?

Answer

cPanel has the /usr/local/cpanel/scripts/checkalldomainsmxs script that will attempt to determine if a domain's mail is supposed to be handled locally or remotely.

1. Connect to your server using SSH as the root user.

2. Make a copy of your local and remote domains files:

   # cp -v /etc/localdomains{,.$( date +%Y%m%d )}

   # cp -v /etc/remotedomains{,.$( date +%Y%m%d )}

3. Run the script with the required flag to confirm:

   # /usr/local/cpanel/scripts/checkalldomainsmxs --yes

   CPANEL_WARN: As this script affects all domains on the server, you must include the --yes flag when you run the script.