mx selection order

[Matus UHLAR - fantomas]

On 22.02.11 20:29, Terry. wrote:
> Given I have these MX records:
> 
> example.com.        3600    IN      MX      10  m1.example.com.
> example.com.        3600    IN      MX      10  m2.example.com.
> example.com.        3600    IN      MX      20  m3.example.com.
> 
> 
> My question is, when m1.example.com is failed to communicate with, the
> remote MTA will continue to talk to m2 or m3?

It seems that RFC5321 orders to try SMTP servers with lowest priority first,
but allows limiting or disabling this feature for specific installations.

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