MX Record Configuration
Barry Finkel
b19141 at achilles.ctd.anl.gov
Tue Oct 31 16:44:30 UTC 2006
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.
----------------------------------------------------------------------
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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