As mentioned before, check the mail-logs at your webserver, you'll find this
authentication required message logged there as response to the hotmail
servers trying to relay mail to that webserver.
At 23-10-2012 14:49, Suresh Ramasubramanian wrote:
authentication required is a bizzarre error to
Suresh Ramasubramanian ops.li...@gmail.com wrote:
authentication required is a bizzarre error to return.
It's fairly normal error from an Exchange server when the client is trying
to relay to a domain that the server doesn't host and when the server
doesn't allow the client to relay. Sounds
Hello,
On Mon, Oct 22, 2012 at 11:16 PM, Carlos M. Perez cpe...@runcentral.com wrote:
Hi,
We're trying to resolve some delivery issues reported by hotmail users.
Started happening a few weeks ago.
SNIP
===
Reporting-MTA: dns;snt0-omc3-s27.snt0.hotmail.com
Received-From-MTA: dns;SNT133-W53
Carlos,
check the mail logs of your web-server, your domain might have a primary
A-record pointing to something different than MX-records. When the MX
servers do something like greylisting and bounce with a temp-code (4xx)
hotmail servers will try alternative records (like @ IN A) and might find
Falling back to A when there is an MX (especially after receiving any kind
of SMTP response from the MX) is an RFC violation by the way (rfc 5321
section 5.1)
Even then - this doesn't appear to be the case. The bounce below was
generated entirely within Hotmail. From SNT133-WS53 (a hotmail
Mike,
I think this is exactly what is going on. The domains that are having
issues have greylisting on with the spam filtering service and are
hosted on a farm of hosting servers. We have blocked port 25 on the
main hosting IP of the web server, and moved the built in mail server to
listen on
Suresh,
The affected domains have never been on hotmail, etc. We've actually
held this domain/hosting for the past 14+ years on this particular
domain. Yes, there is an RFC violation, and it's apparently due to the
greylisting feature from the spam filtering.
Carlos M. Perez
Runcentral, LLC
authentication required is a bizzarre error to return.
Does it go away if you actually turn off graylisting for hotmail?
On Tuesday, October 23, 2012, Carlos M. Perez wrote:
Mike,
I think this is exactly what is going on. The domains that are having
issues have greylisting on with the spam
Hi,
We're trying to resolve some delivery issues reported by hotmail users.
Started happening a few weeks ago. Getting immediate NDRs, and the
server that is supposed to receive the email has no records of
attempts. The messages also don't match what the receiving server
should be sending. The
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