I have noticed that this has been happening on other occasions, where lmtpd does a duplicate_check and then a duplicate_mark on zero length message-ids. This raises the possibility that the server is suppressing messages that are not duplicates, but merely have no message-id header.
That in itself is very weird. Every MTA along the way should add a message-id if there isn't one. Or are you saying there *is* a message-id, but it's empty? That would be horribly broken, but might explain why one isn't added by the MTAs ...
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Sebastian Hagedorn M.A. - RZKR-R1 (Flachbau), Zi. 18, Robert-Koch-Str. 10
Zentrum für angewandte Informatik - Universitätsweiter Service RRZK
Universität zu Köln / Cologne University - Tel. +49-221-478-5587
