QMQP problem

[Frank Rabitsch]

guys,   First of all thanks for all the great work you put into releasing the monthly QMail LDAP patch. It saves me a lot of work because this patch provides me a one stop solution for my QMail environment.   I have a strange problem with QMQP. I'm running a QMail LDAP cluster in three different countries. In two out of the three countries my users are complaining of receiving a lot of double messages.   Investigation of the log file learns me that the messages are indeed send multiple times. The only difference is the qmail ID (946 and 1041) and the time is slightly different on the receiving server. ID's are the same on the sending server.   Received: (qmail 946 invoked from network); 4 Feb 2004 03:05:05 -0000 Received: from unknown ([10.1.0.7])           by mail.ph.magnusint.com (qmail-ldap-1.03) with compressed QMQP; 4 Feb 2004 03:05:05 -0000 Delivered-To: CLUSTERHOST mail.id.magnusint.com [EMAIL PROTECTED] Received: (qmail 1041 invoked from network); 4 Feb 2004 03:07:36 -0000 Received: from unknown ([10.1.0.7])           by mail.ph.magnusint.com (qmail-ldap-1.03) with compressed QMQP; 4 Feb 2004 03:07:36 -0000 Delivered-To: CLUSTERHOST mail.id.magnusint.com [EMAIL PROTECTED] Next to that I see a number of error messages on the sending server:   @400000004021a06822ddb66c delivery 842: deferral: Unable_to_cluster-forward_message:_communication_with_mail_server_failed_(#4.4.2)./ @400000004020c29a27a0013c delivery 2761: deferral: Unable_to_cluster-forward_message:_connection_to_mail_server_timed_out_(#4.4.1)./ At first I thought there was a version conflict between QMail installations but over the weekend I installed the servers on exactly the same QMail LDAP patch (20040101). I did a clean install with default settings provided in the boot scripts. QMQP compression is enabled on the servers.   My suspicion is that the communication channel is somehow interrupted before the receiving party can confirm correct reception of the email which causes the sending party to resend the email. The strange thing is that this only happens in two out of three servers. On the 3rd server I never receive any double messages.   Is this problem connection related? If yes, is there a setting to change so that QMQP is less sensitive to connection errors? SMTP doesn't show the above mentioned problems on the same connection so I assume that QMQP should have the same behavior.   Anything else that went wrong in my setup? Your feedback is appreciated.   regards Frank