RE: [IMail Forum] Blocking call cancelled - but have PTR

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I never noticed that before.  But in another snipped of the log it's the same thing.  Nothing has changed on the firewall except for the IP of the mail server.  It was bad, because we moved buildings, changed IPs, and moved IMail to another server all in the same week.     I know for sure this isn't a message big enough to take 9 minutes to transfer all the data when we have two T1's.  What might cause IMail to take so long to transmit the message and get to the >.   ?  And then isn't it the receiving mail server that's taking an unnaturally long time after my server ends the data to give me the Blocking call cancelled message?   20050301 004748 127.0.0.1       SMTP (2812) >DATA 20050301 004748 127.0.0.1       SMTP (2812) 354 Start mail input; end with <CRLF>.<CRLF> 20050301 005652 127.0.0.1       SMTP (2812) >. 20050301 010052 127.0.0.1       SMTP (2812) rl-recv: Blocking call cancelled 20050301 010052 127.0.0.1       SMTP (2812) 20050301 010052 127.0.0.1       SMTP (2812) SMTP_DELIV_FAILED 20050301 010052 127.0.0.1       SMTP (2812) >QUIT 20050301 010452 127.0.0.1       SMTP (2812) rl-recv: Blocking call cancelled 20050301 010452 127.0.0.1       SMTP (2812) 20050301 010452 127.0.0.1       SMTP (2812) requeuing d:\Imail\spool\Q8fcf015600da2ab4.SMD R0 T12 20050301 010453 127.0.0.1       SMTP (2812) finished d:\Imail\spool\Q8fcf015600da2ab4.SMD status=3     Cavell McDermott Network Administrator Cottonwood Financial 972.753.0822 Office 214.403.4918 Cell http://www.thecashstore.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matt Sent: Tuesday, March 01, 2005 3:07 PM To: IMail_Forum@list.ipswitch.com Subject: Re: [IMail Forum] Blocking call cancelled - but have PTR If this is so widespread and you have a firewall in between you and the other servers, I would place the heaviest suspicion on your firewall instead.  I did note from your logs that the blocking response was received after exactly 4 minutes of inactivity, essentially IMail gave up waiting for a response.  Since the E-mail is being received, it appears that something must be blocking the response from the receiving server.  If that response was blocked and you didn't receive it, that would explain why it is being delivered since you don't have to confirm, and this would also cause your server to requeue the message and try again later. I'm not sure what your firewall might be doing that would block this response, but I would try testing without the firewall if possible in order to eliminate or confirm that as being the issue. Matt mail-lists wrote: I guess some mailservers/firewalls are more strict than others? This happens with at least 10 different domains that users at my company send to. I'll contact a couple to see if there's anything they can/will do about it. I do have a PTR record on the external IP of my firewall, but it points back to mail.cottonwoodfinancial.com. I didn't think it would be bad to have 2 PTR records that resolve to the same host name. Cavell McDermott Network Administrator Cottonwood Financial 972.753.0822 Office 214.403.4918 Cell http://www.thecashstore.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Matt Sent: Tuesday, March 01, 2005 10:09 AM To: IMail_Forum@list.ipswitch.com Subject: Re: [IMail Forum] Blocking call cancelled - but have PTR This is likely not your fault, but a problem with the way that the receiving server is handling the E-mail. They never replied saying that they received it properly so IMail should keep trying until it does or it gets too old. This is likely to be the result of poor spam blocking software on their end. See the following post by Scott for a good explanation of what happened: http://www.mail-archive.com/imail_forum@list.ipswitch.com/msg63677.html The only thing that you can do is try to make sure that there is no reason that you might get blocked. Your server's IP returns both an alias and a host record for a reverse DNS query and I'm not sure if that is normal, but I couldn't find anything in the blacklists or your headers that would indicate any problems. If this was an error with the connection, it wouldn't be happening multiple times in the same way on the same message. It is likely not your problem, and maybe beyond what you might be able to influence outside of that PTR record in the event that it is not standard. Matt mail-lists wrote: Hi All, I'm having an issue with mail being delivered multiple times, but only to certain domains. Our mail server will connect, send the message successfully, then receive an error rl-recv: Blocking call cancelled. IPSwitch says that it's because our mail server does not have a PTR record for the mail server. But we do have one. The only issue that I can see this being, is that our mail server is inside our network with a private address. Therefore, when mail gets sent out, the outgoing IP that other mail servers see if that of our firewall. So when the receiving mail server does a reverse lookup it gets a different IP than that of the A record for mail.cottonwoodfinancial.com. We've got an incoming NAT to direct the smtp traffic to the mail server. My question is why do only certain mail servers reject our mail, and why do they accept it for their users before rejecting it only to have us re queue and send again, up to 20 times or until I delete it from my queue? Is there anything I can do to fix this with the mail server still being inside the network with a private address? 20050301 002754 127.0.0.1 SMTP (2812) d:\Imail\spool\Q4862167001142795.SMD 20050301 002754 127.0.0.1 SMTP (2812) processing d:\Imail\spool\Q4862167001142795.SMD 20050301 002754 127.0.0.1 SMTP (2812) Trying cdw.com (0) 20050301 002754 127.0.0.1 SMTP (2812) Connect cdw.com [12.32.91.169:25] (1) 20050301 002754 127.0.0.1 SMTP (2812) 220 apache.dmz.cdw.com ESMTP NetIQ MailMarshal (v6.0.3.8) Ready 20050301 002754 127.0.0.1 SMTP (2812) >EHLO cottonwoodfinancial.com 20050301 002755 127.0.0.1 SMTP (2812) 250-apache.dmz.cdw.com Hello cottonwoodfinancial.com (65.168.188.242) 20050301 002755 127.0.0.1 SMTP (2812) 250-AUTH LOGIN 20050301 002755 127.0.0.1 SMTP (2812) 250-AUTH=LOGIN 20050301 002755 127.0.0.1 SMTP (2812) 250 SIZE 20050301 002755 127.0.0.1 SMTP (2812) >MAIL FROM:<[EMAIL PROTECTED]> 20050301 002755 127.0.0.1 SMTP (2812) 250 sender ok <[EMAIL PROTECTED]> 20050301 002755 127.0.0.1 SMTP (2812) >RCPT To:<[EMAIL PROTECTED]> 20050301 002755 127.0.0.1 SMTP (2812) 250 Recipient ok <[EMAIL PROTECTED]> 20050301 002755 127.0.0.1 SMTP (2812) >DATA 20050301 002755 127.0.0.1 SMTP (2812) 354 send the mail data, end with . 20050301 003947 127.0.0.1 SMTP (2812) >. 20050301 004347 127.0.0.1 SMTP (2812) rl-recv: Blocking call cancelled 20050301 004347 127.0.0.1 SMTP (2812) 20050301 004347 127.0.0.1 SMTP (2812) SMTP_DELIV_FAILED 20050301 004347 127.0.0.1 SMTP (2812) >QUIT 20050301 004747 127.0.0.1 SMTP (2812) rl-recv: Blocking call cancelled 20050301 004747 127.0.0.1 SMTP (2812) 20050301 004747 127.0.0.1 SMTP (2812) requeuing d:\Imail\spool\Q4862167001142795.SMD R0 T18 20050301 004747 127.0.0.1 SMTP (2812) finished d:\Imail\spool\Q4862167001142795.SMD status=3 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/ -- ===================================================== MailPure custom filters for Declude JunkMail Pro. http://www.mailpure.com/software/ =====================================================