Date: Sat, 14 Aug 2010 12:54:20 -0700 From: Jon Radel <jon@radel.com> To: freebsd-questions@freebsd.org Subject: Re: Open Mail Relay Message-ID: <4C66F46C.2030308@radel.com> In-Reply-To: <4C66DAFC.8050807@gmail.com> References: <20100814172307.035661065697@hub.freebsd.org> <4C66DAFC.8050807@gmail.com>
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This is a cryptographically signed message in MIME format. --------------ms020101090100030501040206 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable On 8/14/10 11:05 AM, Mikhail wrote: > > On 14.08.2010 17:29, peter@vfemail.net wrote: >> I've reviewed my mail logs for the past couple of days and I can't >> find any entries for any mail addressed to the complainer's domain >> name except mail that should have been sent. > > You can try it yourself, with telnet and proper smtp commands. For > example, telnet from outside of your organization to your mail server > and issue: > > ehlo mydomain.com > mail from: foobar@example.com > rcpt to: foobar@example.org > data > test mail > . > > You actually have to get error message about relay denied for you. If > you don't - you're in trouble. > If you do recieve such message - you relay is closed and probably you > have spam worms who send emails from legit user, or something like that= =2E The basic test, but hardly sufficient to determine if all the known ways = of fooling an smtp server are accounted for. Recall from the OP's=20 description: "saying relaying was denied in 17 separate tests." The above also can be an issue if you do the test from an IP address=20 that the SMTP server has been configured to treat as "trusted." --Jon Radel jon@radel.com --------------ms020101090100030501040206--
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