[CentOS] Mailers and records MX

[Rodrigo Barbosa]

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On Tue, Jun 20, 2006 at 02:09:38PM -0500, Les Mikesell wrote:
> On Tue, 2006-06-20 at 15:02 -0500, israel.garcia at cimex.com.cu wrote:
> >  even more details:
> > 
> > 1. I use Mailscanner/postfix in the 3 MX's servers.
> > 2. Using dig I get exactly the same of what I have in my bind server.
> > 3.  http://dnsreport.com/ reports no problem at all.
> 
> Does the 'mail test' give you back the same MX servers you
> see locally with the same values?  If so you must have some
> connectivity problem or there are cached records with different
> values stored somewhere.  Legitimate mailers should always attempt
> to connect to the lowest value first and only try the next after
> a failure.

The catch is that they will try the others even after a temporary
failure. These might include greylisting but also other limits
(max number of children, max connections from IP, max server load etc).

- -- 
Rodrigo Barbosa
"Quid quid Latine dictum sit, altum viditur"
"Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)

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