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 > Action: failed > Status: 5.5.0 > Diagnostic-Code: smtp;550 authentication required > = > > Kindly contact me off-list. > > Thanks, >
