RE: Unable to relay via postfix ... but telnet works...?
Dr. Wietse, Thank you again for your time. I have been an off-and-on-again user of Postfix for many years, and it is a real honor (and surprise!) to get support directly from its originator. > The hop-count limit is reached in the REMOTE mail server. I suspected as much, but I wasn't sure. Thanks for clarifying this. > There are two possibilities: > > - The failing message already has lots of Received: headers (which > is something that you may be able to fix by removing some or all). It doesn't because the message is being created at the server where Postfix is installed. > - The REMOTE mail server has an unreasonably-low hop-count limit > (which is something that only the remote system adminstrator can > fix). This is the only possibility that remains... and since the system administrator for that system is difficult to communicate with, my guess was that the single innocent "Received:" header added by Postfix was the tipping point. For this reason, I used the "header_checks" parameter to strip it off before sending it to the external mail server... ...and now everything works. Thank you very much! Your work makes a real difference. Ahmed.
Re: Unable to relay via postfix ... but telnet works...?
A. Abd-Allah: > Dr. Wietse, > > Thank you for your valuable time, not just for this question, but > for the entire postfix product. > > If I understood you correctly, increasing the hop count limit may > help in this case. I only see 1 or 2 headers that are being added, > but I am not sure. I can try changing the limit and then seeing > the effect. The hop-count limit is reached in the REMOTE mail server. There are two possibilities: - The failing message already has lots of Received: headers (which is something that you may be able to fix by removing some or all). - The REMOTE mail server has an unreasonably-low hop-count limit (which is something that only the remote system adminstrator can fix). Wietse > A. Abd-Allah: > > Final-Recipient: rfc822;bob@gmail.comAction: failedStatus: > > 5.0.0Remote-MTA: smtp;MAILGW1.OURDOMAIN.COMDiagnostic-Code: X-Notes; > > Error transferring to MAILGW1.OURDOMAIN.COM; Maximum hop count > > exceeded. Message probably in a routing loop. > > When a mail server receives mail via SMTP, the standard requires > that it adds a header with: > > Received: stuff. > > Many MTAs count the number of such message header lines and report > a "Maximum hop count exceeded" error because the number exceeds > some upper bound. > > With Postfix, the default is "hopcount_limit = 50". > > Your "telnet" message had no such header, while the "non telnet" > message presumably had several. That's why one triggers the > error and the other does not. > > Wietse
RE: Unable to relay via postfix ... but telnet works...?
Dr. Wietse, Thank you for your valuable time, not just for this question, but for the entire postfix product. If I understood you correctly, increasing the hop count limit may help in this case. I only see 1 or 2 headers that are being added, but I am not sure. I can try changing the limit and then seeing the effect. Thank you again. > Subject: Re: Unable to relay via postfix ... but telnet works...? > To: postfix-users@postfix.org > Date: Fri, 17 Feb 2012 14:52:41 -0500 > From: wie...@porcupine.org > > A. Abd-Allah: > > Final-Recipient: rfc822;bob@gmail.comAction: failedStatus: > > 5.0.0Remote-MTA: smtp;MAILGW1.OURDOMAIN.COMDiagnostic-Code: X-Notes; > > Error transferring to MAILGW1.OURDOMAIN.COM; Maximum hop count > > exceeded. Message probably in a routing loop. > > When a mail server receives mail via SMTP, the standard requires > that it adds a header with: > > Received: stuff. > > Many MTAs count the number of such message header lines and report > a "Maximum hop count exceeded" error because the number exceeds > some upper bound. > > With Postfix, the default is "hopcount_limit = 50". > > Your "telnet" message had no such header, while the "non telnet" > message presumably had several. That's why one triggers the > error and the other does not. > > Wietse
Re: Unable to relay via postfix ... but telnet works...?
A. Abd-Allah: > Final-Recipient: rfc822;bob@gmail.comAction: failedStatus: > 5.0.0Remote-MTA: smtp;MAILGW1.OURDOMAIN.COMDiagnostic-Code: X-Notes; > Error transferring to MAILGW1.OURDOMAIN.COM; Maximum hop count > exceeded. Message probably in a routing loop. When a mail server receives mail via SMTP, the standard requires that it adds a header with: Received: stuff. Many MTAs count the number of such message header lines and report a "Maximum hop count exceeded" error because the number exceeds some upper bound. With Postfix, the default is "hopcount_limit = 50". Your "telnet" message had no such header, while the "non telnet" message presumably had several. That's why one triggers the error and the other does not. Wietse
