[cobalt-users] redirect postmaster emails to postmaster@xxxxxxxxxxxxxxxx

["Kevin D" <kdlists@xxxxxxxxxxxxxxx>]

My client has an internal mail server and uses my server to relay mail. My
server also receives mail for their server's domain and relays it to their
server. How can I configure sendmail so that when an error occurs at this
particular domain, instead of postmaster@xxxxxxxxxxxx receiving the message,
it goes directly to their postmaster at postmaster@xxxxxxxxxxxxxxxx ?

I perused the config file and ww.sendmail.org but I couldn't find anything
on this. Is it even possible?

Thanks,
Kevin