configuring sendmail to reject spoofed email addresses

[Nathaniel Hall]

Incorrect.  His e-mail is actually from redhat-list-bounces at redhat.com ( on
behalf of him ).  The return patch is "Return-Path:
<redhat-list-bounces at redhat.com>".  This is how it should be.

Some e-mail clients, instead of showing the real from address, will show the
address of the person you specify.  In this case, the mailing list software
replaces the users address (dtyler at frazerbilt.com) with the mailing list
address (redhat-list-bounces at redhat.com) but still trys to make it appear
dtyler is sending it.  Outlook 2003 tells you someone else's email address
sent it, but it was supposed to be from dtyler.

~~~~~~~~~~~~~~~~~~~~~~~~~~
Nathaniel Hall
Intrusion Detection and Firewall Technician

Ozarks Technical Community College -- Office of Computer Networking
417-799-0552


-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com]
On Behalf Of Ed Wilts
Sent: Tuesday, July 20, 2004 8:45 AM
To: General Red Hat Linux discussion list
Subject: Re: configuring sendmail to reject spoofed email addresses

On Tue, Jul 20, 2004 at 07:25:34AM -0500, Donald Tyler wrote:
> Is there anyway to configure sendmail so that if there is an email address
> in the "From" section, and it does not match the "Return-Path" section,
for
> it to reject the email?

If I would have configured my system this way, your e-mail would have
been rejected.

You may want to run a report of all your e-mails and compare the From
address with the Return-Path address and see what you would have
rejected.

-- 
Ed Wilts, RHCE
Mounds View, MN, USA
mailto:ewilts at ewilts.org
Member #1, Red Hat Community Ambassador Program


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