R. Scott Perry wrote:
> >Is there any reason why Imail will try to deliver to the A record of a
> >domain if it fails to connect to the MX record? Can you disable it?
>
> The RFC requires that IMail do that. I don't believe it can be disabled.
Are you sure about this?
My reading is that using 'A' records is only permissible when there
are no 'MX' records.
To quote from RFC2821:
If one or more MX RRs are found for a given
name, SMTP systems MUST NOT utilize any A RRs associated with that
name unless they are located using the MX RRs; the "implicit MX" rule
above applies only if there are no MX records present. If MX records
are present, but none of them are usable, this situation MUST be
reported as an error.
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