Oh, about "antigen@xent.com"

Kragen Sitaker kragen@pobox.com
Mon, 29 Oct 2001 18:04:17 -0500 (EST)

Postfix, like sendmail, has the unfortunate habit of qualifying
unqualified email addresses with the local domain.  That means that if
Aaron Blosser's (misconfigured, abusive) mail system sent email "From:
Antigen", then xent's mailer would rewrite it to "Antigen@xent.com".
So it probably didn't have a forged From: address, just an invalid

<kragen@pobox.com>       Kragen Sitaker     <http://www.pobox.com/~kragen/>
Perilous to all of us are the devices of an art deeper than we possess
       -- Gandalf the White [J.R.R. Tolkien, "The Two Towers", Bk 3, Ch. XI]