configuring sendmail to reject spoofed email addresses

[Ed Wilts]

On Tue, Jul 20, 2004 at 09:10:25AM -0500, Nathaniel Hall wrote:
> 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.

Which is exactly what I said.  The From (dtyler) address does not match the
Return-Path address (redhat-list-bounces).  He wanted to reject those
addresses where they didn't match.

> Outlook 2003 tells you someone else's email address
> sent it, but it was supposed to be from dtyler.

You're the one using Outlook, not me :-).  I looked at the headers I
received in the final message.

There are, however, 2 From addresses.  There's the envelope from and the
message from, and they could be different.  That could be what we're
talking about here.

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