On 9/30/2011 10:49 AM, ajm wrote: > Hello! > > > > I recently installed a new mail server with postfix 2.8.2. This > machine replaced an older one, with nearly the same features and > configurations. > > > > Since that, however, I'm experimenting problems to send emails to > only one destination. Logs show: > > > > Sep 28 18:51:27 mailserver postfix/smtp[21279]: 3418C61EE1: enabling > PIX workarounds: disable_esmtp delay_dotcrlf for > oa.pt[213.146.196.92]:25 > > > > Sep 28 18:51:47 mailserver postfix/smtp[21279]: > 3418C61EE1: to=<x...@adv.oa.pt>, relay=oa.pt[213.146.196.92]:25, > delay=3207, delays=3167/0/20/20, dsn=4.0.0, status=deferred (host > oa.pt[213.146.196.92] said: 421 DNS temporary failure at return MX > check, try again later (#4.3.0) (in reply to MAIL FROM command)) > > > > I started checking for DNS problems. Everything seems to be correct, > both A and MX records, as well as reverse resolution. > > I already tried to disable pix workarounds, as older version didn't > have this feature and worked well, but there were no changes in > results. Can somebody please help me on this subject? > >
The server at 213.146.196.92 is refusing your mail; only they can give you an authoritative answer why. >From the message returned, I assume they are doing an MX lookup on the MAIL FROM domain, and that lookup fails. This doesn't have anything to do with the pix workarounds. -- Noel Jones
