Kinda OT: "valid mail server"?

[Matthew Carpenter]

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