MX Record Configuration
Gregory Hicks
ghicks at cadence.com
Tue Oct 31 17:09:19 UTC 2006
> To: bind-users at isc.org
> Subject: Re: MX Record Configuration
> Date: Tue, 31 Oct 2006 10:44:30 -0600 (CST)
> From: b19141 at achilles.ctd.anl.gov (Barry Finkel)
>
> Kevin Darcy replied to a posting:
>
> >There's nothing magical about the first label of the name, in SMTP
> >terms. The only thing that really matters in terms of SMTP failover
is
> >the preference value. If your box -- whatever it's called -- has a
> >preference of 5 and your ISP's box -- whatever it's called -- has a
> >preference of 10, then mail will be delivered to your box, if
possible,
> >and only if it is not possible will sending MTAs fail over to your
ISP's
> >server.
>
> When I last looked at spam statistics on our backup mail relay box,
> I found that 25% of the mail to that box was legitimate mail, and
> 75% was spam. I know that our primary mail relay box was not
> unavailable 25% of the time, so there are mailers on the Internet
> that do not follow the rules in the MX RFC. I did not have time to
> look at some of the mail to try to determine what mail software
> delivered the mail to the higher preference MX host.
Spammers deliver mail to the higher numbered MX hosts deliberately
because they figure that the anti-sapm measures on the backup mail
server are not as good as on the primary mail servers.
> ----------------------------------------------------------------------
> Barry S. Finkel
> Computing and Information Systems Division
> Argonne National Laboratory Phone: +1 (630) 252-7277
> 9700 South Cass Avenue Facsimile:+1 (630) 252-4601
> Building 222, Room D209 Internet: BSFinkel at anl.gov
> Argonne, IL 60439-4828 IBMMAIL: I1004994
>
>
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Gregory Hicks | Principal Systems Engineer
Cadence Design Systems | Direct: 408.576.3609
555 River Oaks Pkwy M/S 9B1
San Jose, CA 95134
I am perfectly capable of learning from my mistakes. I will surely
learn a great deal today.
"A democracy is a sheep and two wolves deciding on what to have for
lunch. Freedom is a well armed sheep contesting the results of the
decision." - Benjamin Franklin
"The best we can hope for concerning the people at large is that they
be properly armed." --Alexander Hamilton
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