mx selection order

Torinthiel torinthiel at
Tue Feb 22 13:13:21 UTC 2011

Dnia 2011-02-22 20:29 Terry. napisał(a):

>Given I have these MX records:
>        3600    IN      MX      10
>        3600    IN      MX      10
>        3600    IN      MX      20
>My question is, when is failed to communicate with, the
>remote MTA will continue to talk to m2 or m3?

From the beginning: MTA should randomly try m1 or m2, if it fails then the 
other one, and if both fail than m3.
algorithm is simple:
try random one from amongst ones with lowest precedence, discarding those 

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