Kinda OT: "valid mail server"?

[Jack Berger]

Requiring a reverse lookup of the sending MTA is a form of spam blocking. We put
the rule in place for about a week and a half on our server. Kept out an amazing
amount of stuff, but also blocked a good number of our members and friendlies.
Finally had to remove it because we didn't want to play mail server police to
the world. And some people just flat refused to put it in place for unspecified
"security reasons".

-jhb-

From:      Matthew Carpenter <matt at eisgr.com>

That could be it.  Many MTA's require the sending MTA to be resolvable
(reverse lookup).

From: Matt Nelson <n5tkn at zonekeeper.org>
To: isp-tech at isp-tech.com
Subject: Totally OT: valid mail server
Date: 21 Oct 2002 18:21:05 -0500
X-Mailer: Ximian Evolution 1.0.8 (1.0.8-10) 

Can anyone tell me why Redhat's list server is rejecting my subscription
attempts, saying I must use a valid mail server?  I don't have this
problem with any other list I subscribe to.  I run my own mail servers,
but do not run my own reverse DNS.  Could this be the problem?  Even so,
why would Redhat be that paranoid?

Thanks

--
Matt