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 On 10/23/2012 4:37 AM, Suresh Ramasubramanian wrote: > 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 > webserver) to snt-omc3-s27.snt0.hotmail.com > <http://snt-omc3-s27.snt0.hotmail.com> - which I believe is part of > their outbound mail farm. That's where the bounce was generated. > > "Requires authentication" might be because whatever domain is being > sent to was originally hosted on hotmail, and set to require > authentication to relay out through hotmail's servers. > > --srs > > On Tuesday, October 23, 2012, Michiel Klaver wrote: > > 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 a > listening mail-daemon at your webserver. > > > At 23-10-2012 00:16, Carlos M. Perez wrote: > > 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 server(s) listed in the MX should > receive all > > email without authentication, since it's a mail filtering > service (Maxmail) > > > > = > > Reporting-MTA: dns;snt0-omc3-s27.snt0.hotmail.com > <http://snt0-omc3-s27.snt0.hotmail.com> > > Received-From-MTA: dns;SNT133-W53 > > Arrival-Date: Mon, 22 Oct 2012 14:09:49 -0700 > > > > Final-Recipient: rfc822;administra...@xxxx.com <javascript:;> > > Action: failed > > Status: 5.5.0 > > Diagnostic-Code: smtp;550 authentication required > > = > > > > Kindly contact me off-list. > > > > Thanks, > > > > > > -- > --srs (iPad) > >
