Hello, A little over a year ago, I was pulled from my position as a software engineer to begin working as an admin for a company with no infrastructure. I initially installed qmail, but quickly switched to courier when faced with the need for a web interface. This was a measure driven largely to avoid having to install an exchange server, the "obvious" choice of those above me. (Thank you Sam for providing/maintaining such a robust a feature rich set of software.)
To date I have had few problems with mail service, or at least delivery failures were of unimportant mail and went unnoticed. Recently however we are having problems communicating with a number of new business relations, in particular Qualcomm and HP. This mail is critical and I am under considerable pressure to resolve it. In an effort to solve things, I have read up a bit on the smtp protocol and yesterday rebuilt my system from the latest codebase at sourceforge, Courier 0.37.2. This did not resolve the matter, but I thought I would get current before asking for help. Here is a snippet from my logs of a typical problem: Jan 27 08:06:26 reckoning courieresmtpd: started,ip=[::ffff:129.46.64.204] Jan 27 08:06:26 reckoning courieresmtpd: error,relay=::ffff:129.46.64.204,msg="5 02 ESMTP command error",cmd: XXXX warlock.qualcomm.com Jan 27 08:06:34 reckoning courieresmtpd: error,relay=::ffff:129.46.64.204,msg="5 02 ESMTP command error",cmd: XXXXXXXX My understanding is as follows. On connecting, a server may attempt various extended smtp commands. A 502 error indicates that while the server understands esmtp, the particular command is unimplemented. The connecting server is then free to attempt other extended commands or step down to the standard default commands (smtp) for mail delivery. The 502 error is not uncommon in my logs, but it is also often accompanied with the subsequent successful delivery of mail. In the problematic cases the user is sending embedded attachments from an outlook client (I am unfamiliar with the differences in how this translates in the resulting MIME formats) with the final delivery being attempted from a sendmail server. This error is reproducible, and consistently logged as above. I have read through the mailling lists and searched the web. The only apparent "problem" with courier are the issues surrounding 8bit MIME. Is my problem possibly related to this? Is it possible to get more verbose logging indicating what the attempted commands are? Do I need a packet sniffer? I am at a loss and again under pressure to move to the "panacea of an exchange server". I know better, any input would be sincerely appreciated. Regards, Todd VanderVeen PartNET Systems Manager 801-891-0741 _______________________________________________ courier-users mailing list [EMAIL PROTECTED] Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
