MX choosing

[Feng He]

Thanks. this is the description:

   When the lookup succeeds, the mapping can result in a list of
   alternative delivery addresses rather than a single address, because
   of multiple MX records, multihoming, or both.  To provide reliable
   mail transmission, the SMTP client MUST be able to try (and retry)
   each of the relevant addresses in this list in order, until a
   delivery attempt succeeds.  However, there MAY also be a configurable
   limit on the number of alternate addresses that can be tried.  In any
   case, the SMTP client SHOULD try at least two addresses.

On Fri, Jul 22, 2011 at 5:11 PM, Matus UHLAR - fantomas
<uhlar at fantomas.sk> wrote:
> On 22.07.11 16:50, Feng He wrote:
>>
>> Given the MX hosts for sympatico.ca domain:
>>
>> $ dig sympatico.ca mx +short
>> 5 mxmta.sympatico.ca.
>>
>> $ dig mxmta.sympatico.ca +short
>> 67.69.240.17
>> 67.69.240.24
>> 67.69.240.22
>> 67.69.240.23
>> 67.69.240.21
>> 67.69.240.20
>> 67.69.240.19
>> 67.69.240.18
>>
>>
>> when the peer MTA fail to talk to one of these hosts,will it try the
>> next one? or it just give up?
>
> this is out of DNS and BIND scope.
> see rfc 5321, section 5.1 for MTA requirements.
> --
> Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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