On Sat, Feb 27, 2016 at 7:23 PM, Mark Jeftovic <mar...@easydns.com> wrote:
> > 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 of domains that are > sending you mail.. Though a domain rather than IP bl may make sense. > > > > Sorry, I realized after I sent that I needed to clarify that what I'm > observing are MTAs attempting to deliver email to addresses at IP of the > A record for the domain, ignoring the presence of its NULL MX. > > So the originating MTAs are ignoring the NULL MX and attempting to > deliver to the A hostname, leading me to surmise they are spambots or > zombies. > 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?
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