postfix-users

Re: dns A records not used when there's no MX

Subject: Re: dns A records not used when there's no MX
From: Rod Dorman <rodd AT polylogics DOT com>
To: postfix-users AT postfix DOT org
Date: Sat, 11 Aug 2007 23:29:00 -0400
On Saturday, August 11, 2007, 22:27:41, Chris wrote:
> On Sat, 11 Aug 2007 22:11:24 -0400
> Rod Dorman <rodd AT polylogics DOT com> wrote:
>> On Saturday, August 11, 2007, 21:10:21, Chris wrote:
>> >   ...
>> > You NEED a valid MX record for mail to work.    ...
>> 
>> No, you don't.
>> 
>> RFC 2821 section "5. Address Resolution and Mail Handling" is quite
>> explicit.
>> 
>>    "If no MX records are found, but an A RR is found, the A RR is
>>    treated as if it was associated with an implicit MX RR, with a
>>    preference of 0, pointing to that host."
>
> While that may be true, users that setup RFC compliant servers may
> reject the Ops server.

But it *is* RFC compliant.

> In addition, if the Op is able to do his/her own DNS - then it's a
> poor way of doing DNS imho.

No argument about that.

-- 
rodd AT polylogics DOT com     "The avalanche has already started, it is too
Rod Dorman              late for the pebbles to vote." - Ambassador Kosh


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