RE: configuring sendmail to reject spoofed email addresses

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Incorrect.  His e-mail is actually from redhat-list-bounces@xxxxxxxxxx ( on
behalf of him ).  The return patch is "Return-Path:
<redhat-list-bounces@xxxxxxxxxx>".  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@xxxxxxxxxxxxxx) with the mailing list
address (redhat-list-bounces@xxxxxxxxxx) 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@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx]
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@xxxxxxxxxx
Member #1, Red Hat Community Ambassador Program


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