On Fri, Mar 26, 1999 at 12:12:12PM -0500, Verrall McEwen wrote:
> I am interested in setting up a relay host on my system; however, I am
> concerned about the risks of operating an open relay. There is no way for
> me to determine every senders domain for "rcpthosts". Is there anyway I
> can verify mail based on the sender?
With patches to qmail-smtpd you can, but it's not a good thing to do. Anyone
can forge a sender address, so anyone could use you for a relay if that's what
you check for.
You might want to read http://www.palomine.net/qmail/relaying.html and the
related http://www.palomine.net/qmail/selectiverelay.html for more than you
want to know about safe relaying with qmail.
Chris
