You haven't been hacked. That is the standard response by the "resend"
script to a message without a valid sender. You'll find it in the "sub
check_sender" subroutine in the resend script, at about line 988.
On Wed, 29 Nov 2000, Noce, Guy wrote to 'email@example.com':
> Hello to all. This is a weird message that's started coming back to
> all the closed lists on campus. I'm not unconvinced that the someone
> has hacked our server, but it's a UNIX machine, and I'm from VMS.
> Thanks for all help, and private e-mail is okay.
> mail2.towson.edu: majordom set sender to
> firstname.lastname@example.org using -f
> BOUNCE email@example.com: This may be
> hard to believe, but there was no "From:" fieldin
> this message I just received. I'm not gonna send it
> out, but you can...
Chip Old (Francis E. Old) E-Mail: firstname.lastname@example.org
Manager, BCPL Network Services Voice: 410-887-6180
Manager, BCPL.NET Internet Services FAX: 410-887-2091
Baltimore County Public Library ICBM: 39.39910 N
320 York Road 76.60300 W
Towson, Maryland 21204 U.S.A.
From: "Noce, Guy" <email@example.com>