"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 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 another IP. This appears to be working, or at least has been > for almost 12 hours. > > The real question is why is hotmail/live the only system that apparently > does this; which seems to be in contradiction to RFC, and how everyone > else does it. The one thing that MS chooses to be different with... > > Thanks, > > Carlos M. Perez > Runcentral, LLC > > On 10/23/2012 4:28 AM, 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 > >> 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)
