Say I have a host "myhost.mydomain.com" running sendmail.
And I want firstname.lastname@example.org to receive the messages send to "root@myOTHERdomain.com".
And say that I already created an MX record for "myOTHERdomain.com" is pointing to "myhost.mydomain.com".
What variable/parameter do I need to change in sendmail.cf to have "myOTHERdomain.com" as an alias domain for the local delivery to the mailboxes on "myhost.mydomain.com" ?
In other words: messages sent to root@myOTHERdomain.com should reach the mailbox of email@example.com