Re: exim4 e il campo MX dns

Q0311:  When a DNS lookup for MX records fails to complete, why doesn't
Exim send the messsage to the host defined by the A record?

A0311:  The RFCs are quite clear on this. Only if it is known that there
are no MX records is an MTA allowed to make use of the A record. When an MX
lookup fails to complete, Exim does not know whether there are any MX
records or not. There seem to be some name servers (or some configurations
of some name servers) that give a “server fail” error when asked for a
non-existent MX record. Exim uses standard resolver calls, which
unfortunately do not distinguish between this case and a timeout, so all
Exim can do is try again later.


2014-08-22 22:56 GMT+01:00 vanni <[email protected]>:

>
>
> Salve a tutti,
>
> ho una macchina con su exim 4.80 e talvolta da certi domini le mail non
> arrivano,
> il dominio è senza campo MX , vorrei sapere come questo influisce.
> Cioè , l'smtp server prima verifica l'esistenza del mx , e se non c'è
> prova a mandare la mail all'ip diretto ?
>
> Funziona cosi' ?
>
>
> Grazie
>
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-- 
d.

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