sendmail masquerading not working with mail/mutt
 

I have set up sendmail on my OpenBSD 3.6 box to use masquerading. I've tested it and it works.

Mail from <user@host.example.com> gets rewritten as <user@domain.com> which is what I want.

Now, when I invoke
the rewriting happens and sender and envelope sender are set correctly as <user@domain.com>. However when I send mail using either mail or mutt sender and envelope sender show up as user@host.domain.com.

Mutt and mail both invoke sendmail so why this difference?

Arjan