In /etc/mail/sendmail.mc, look at all the "masq" options. I'm setting: MASQUERADE_AS(`noir.com')dnl FEATURE(masquerade_envelope)dnl FEATURE(masquerade_entire_domain)dnl --rich Michael S. Dunsavage wrote: > My machine domain is zeus.msdcomputing.com > > How can I set sendmail to masquerade that as msdcomputing.com when I send out > emails?