On Tue, Jan 27, 2009 at 09:52:30AM -0500, Linux Addict wrote:
>> The Internet email RFCs do not require MX records. They specify
>> that the MTA must deliver by A records when MX records don't exist.
>
> I dont know if its convincing to send mails to a host where no smtp is
> running(hence no MX record) but is there anyway at all in Postfix to check
> for MX record before the qmgr accepts the mail?
You are mightly confused. By definition (RFC 5321) of the SMTP protocol,
a domain with just an A records has an *implicit* MX record:
example.com. IN MX 0 example.com.
There is no valid "no smtp is running" => "hence no MX record" inference.
> I know Postfix is compliant to all RFCs, but just wondering anything
> customizable exists.
Postfix can reject SMTP mail from sender domains that have neither A
records nor MX records:
http://www.postfix.org/postconf.5.html#reject_unknown_sender_domain
such domains cannot receive mail, since they have neither explicit, nor
implicit MX records.
--
Viktor.
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