Can you put a sniffer on the wire to see if you are getting a response or not? Are you running the DNS server on the IMail box and is it MS DNS? What OS? If 2K3 you might need to disable the EDNS..What version of IMail? If prior to 8.14 then try upgrading to 8.14..there was a fix in it for when you are running DNS on the same machine as IMail
Eric S ----- Original Message ----- From: "Spaminator" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, December 10, 2004 4:54 PM Subject: Re: [IMail Forum] Reverse DNS Issue > The spam logs don't say much more than that it failed. But like I said, on the same mail server if I run a reverse lookup from the command prompt it works fine, every single time. Same thing from the DNS server. And this isn't a transient thing-- it seems to happen to tons of "known good" domains. I can only turn it on for a few minutes before I need to turn it off again. And yes, all the regular DNS lookups that iMail does seem to work fine-- we have a small queue and don't see issues in our sys logs... > > This is one example from a single sender who tried sending us a bunch of emails over the past two days, and all were filtered despite the fact that the PTRs are there and reverse lookups seem to work fine from within Windows. I'm stumped. > > 12:10 10:04 SMTPD(c8ea47b000a2e1d0) [00002796] <mail.XXX.com> VALIDATION: (REVDNS) mail.XXXX.com FAILED reverse DNS validation for address (65.32.5.135) > > > ---------- Original Message ---------------------------------- > From: "E. Shanbrom \(Ipswitch\)" <[EMAIL PROTECTED]> > Reply-To: [EMAIL PROTECTED] > Date: Fri, 10 Dec 2004 16:43:53 -0500 > > Is it the lookup that's failing or the DNS response not getting received? > What do the spam logs show > > Eric S > ----- Original Message ----- > From: "Spaminator" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Friday, December 10, 2004 2:38 PM > Subject: [IMail Forum] Reverse DNS Issue > > > > Hello, > > > > Has anyone been having any issues since last week with the reverse DNS > lookup connection filtering option? > > > > I have had large numbers of false-positives reported from our users, and > for almost every one when I do a reverse lookup on the mail server manually, > I get a response. It seems iMail, for whatever reason, is not working. > > > > I also did the same reverse lookup on the DNS servers specified in the > iMail SMTP settings, and it worked there as well. > > > > Anyone know of any issues with reverse DNS in iMail? This seems to have > started after we deployed 8.14 last week, but I'm not sure. We've used > revlookups for many months previous to that and didn't seem to have a > problem with reverse lookups failing on IPs that do indeed have PTRs. > > > > Thanks, and Happy Holidays! > > > > > > > > > > > > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > > > > > > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
