Are the messages calendar invites, by any chance? In Exchange you can specify how certain items are sent to certain domains. They should consider looking at that.
-----Original Message----- From: mailop [mailto:mailop-boun...@mailop.org] On Behalf Of Benoit Panizzon Sent: Friday, June 9, 2017 2:31 AM To: mailop@mailop.org Subject: [mailop] Lotus Notes and "250 2.6.0 Bad message, but will be delivered anyway" Hello We have a 'challenging' problem between two companies sending each other emails. The sender keeps getting notifications, that his emails to the recipient are delayed. But this is not true. Analyzing the email headers the recipient sent me I can confirm, the emails take about two seconds! from sender to the recipient. The sender, if I got that right from the headers, uses Lotus Notes and is relaying messages via the SMTP server of his ISP, which relays it to our postfix server. I suspect the message "250 2.6.0 Bad message, but will be delivered anyway" is somehow generated by lotus notes or an intermediary email scanner and lotus notes translates this to 'your message could not be delivered and is being delayed, the server will continue to try to deliver the email' The recipient uses an exchange server behind a postfix based email scanner service. After sniffing the connections and looking at the logs, I am pretty sure, the "250 2.6.0 Bad message, but will be delivered anyway" is not generated from our postfix server, or from our customer's exchange server. But the sender tells me, that this message only shows, when he is sending an email to our customer. Has anyone seen such a message and has any clue what causes it, and also what causes lotus notes to send an DSN telling the sender the message could not be delivered, despite the message being delivered perfectly in time? Google tells me that "250 2.6.0 Bad message, but will be delivered anyway" is an error message generated by ISPConfig. But as far as I found out, no server relaying the email uses this mailer. Kind regards -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________ _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
