In article you
write:
>Suresh Ramasubramanian wrote:
>
>> A domain with a null mx may well originate email
>If they try to do that they will be sad.
RFC 7505 section 4.2 agrees with you. Section 4.1 suggests
Franck Martin via mailop wrote:
>
> This could be true but then RFC7505 is recent, so I'm not sure that proper
> MTAs are yet properly behaving. I wonder what sendmail, postfix, exim
> really do?
Exim has treated null MXs as invalid since 2004.
Suresh Ramasubramanian wrote:
> A domain with a null mx may well originate email
If they try to do that they will be sad.
A lot of MTAs will reject email with a MAIL FROM using a domain that is
invalid according to the DNS, and a null MX counts as invalid for this
purpose.
My test with postfix yielded:
Status: 5.4.4
Diagnostic-Code: X-Postfix; Name service error for name=abx.ca type=MX:
Malformed or unexpected name server reply
so at least it hard failed.
- mark
On 2016-02-28 12:07 AM, John Levine wrote:
>> What is an MTA supposed to do with a message
>What is an MTA supposed to do with a message addressed to a domain with
>a NULL MX?
Reject it with a 556 status code and 5.1.10 enhanced status code. If
the message was already relayed, return a DSN if it makes sense. See
section 4.1.
You can also feel free to reject mail if the return
;
Sent: 2/27/2016 8:12 PM
To: Michael Wise<mailto:michael.w...@microsoft.com>
Cc: Franck Martin<mailto:fmar...@linkedin.com>; Mark
Jeftovic<mailto:mar...@easydns.com>; mailop<mailto:mailop@mailop.org>
Subject: Re: [mailop] proper NULL MX behaviour for MTAs?
If there's a
l.com>;
mailop<mailto:mailop@mailop.org>
Subject: Re: [mailop] proper NULL MX behaviour for MTAs?
On Sat, Feb 27, 2016 at 7:23 PM, Mark Jeftovic
<mar...@easydns.com<mailto:mar...@easydns.com>> wrote:
On 2016-02-27 9:59 PM, Suresh Ramasubramanian wrote:
> A domain
If a domain is telling me it does not accept emails, why should I accept
mail from such domain if I cannot reply back to it?
On Sat, Feb 27, 2016 at 6:59 PM, Suresh Ramasubramanian wrote:
> A domain with a null mx may well originate email but will absolutely not
> receive
On 2016-02-27 9:59 PM, Suresh Ramasubramanian wrote:
> A domain with a null mx may well originate email but will absolutely not
> receive email - so mail gets trashed at your end as well without staying
> endlessly on your mall queues
>
> You can possibly correlate that mx with the behavior
A domain with a null mx may well originate email but will absolutely not
receive email - so mail gets trashed at your end as well without staying
endlessly on your mall queues
You can possibly correlate that mx with the behavior of domains that are
sending you mail.. Though a domain rather
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