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RE: [cobalt-security] Pros & Cons of change to Sendmail and can you do this on a Qube 3 ?
- Subject: RE: [cobalt-security] Pros & Cons of change to Sendmail and can you do this on a Qube 3 ?
- From: Dan Keller <cobalt@xxxxxxxxxx>
- Date: Tue, 04 May 2004 16:56:42 -0700
- List-id: Mailing list for users to address network security on Cobalt products. <cobalt-security.list.cobalt.com>
At 09:13 PM 5/4/2004 +0200, you wrote:
>> May 4 10:58:51 mailer sendmail[4006]: i44EwpC04006:
>> ruleset=check_mail,
>> arg1=<gxdrs@xxxxxxxxxx>, relay=[12.109.64.201], reject=501 5.1.8
>> <gxdrs@xxxxxxxxxx>... Domain of sender address
>> gxdrs@xxxxxxxxxx does not exist
>
>not the same thing, this is a reject for non existant domains. Dropping mail
>for which reverse dns produces a different name then the mailserver used to
>id' itsself will block way more servers.
Yes, and that is probably a desirable outcome
because there is no legitimate reason for a sender
to falsify his or her return address.
But wouldn't it also cause to be rejected
any mail that was delivered via a relay?
Dan Keller
San Francisco