Hi, We are currently running cyrus-imapd-2.1.11 with duplicate delivery suppression enabled.
One of our users complained that they were not receiving their mail. Having looked at the logs I noticed a string of entries like the following: Jun 25 13:11:43 machine lmtpd[18521]: duplicate_check: user.XXXXX 1056537904 Jun 25 13:11:43 machine lmtpd[18521]: dupelim: eliminated duplicate message to user.XXXXX id Notice that the message-id is missing. The entries correspond to mail sent by the same sender which do not contain a message-id header. It appears that lmtpd has been suppressing mail from this sender, because it assumes that all mail with a zero length message-id is a duplicate of the last. 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. Has anyone else seen this happening?. If this continues to happen we may have to disable duplicate delivery suppression. Thanks -- Stephen Grier Systems Developer Computing Services Queen Mary, University of London
