MX Record Configuration

Edson Alvarenga J. ealvarenga at
Tue Oct 31 21:29:39 UTC 2006

I had a problem whit my mail server, the problem was in my DNS Server, 
the named was 97% CPU, then resolved some domains, I want Know, Why the 
named arrived to 97%, i check my logs and don´t had Intrusion.
Somebody helpme.

Best Regards,


Barry Finkel escribió:
> 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
> Argonne, IL   60439-4828             IBMMAIL:  I1004994

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