See the thread about "Incoming email suddenly dead" for previous posting. And http://www.mail-archive.com/otrs@otrs.org/msg06645.html. Elsewhere I did see someone speculate/point out that the problem could be with Message-Ids containing the percent sign(%) being passed to the sprintf in Syslog.pm. From my own experience, I'd say that this rings true. It was a message that suddenly broke the queue and it's message-id did contain the '%' character. If this is all true, then this seems to represent a potentially serious problem for OTRS installations. In same astute thread that speculated about the cause of this error, they did mention the potential for DOS attacks against OTRS systems with such a message-id. From what I can find, having this character in the id does not seem out of line with the specification -- however, I am not even close to authoritative on the subject. OTRS community -- please set me straight. If my understanding is in error here, and my particular installation lacks some sort of previous patch/fix for this problem, please let me know. What is your assessment? I'm sorry that I can't find and cite the URL source of the original speculation that led to my own confirmed solution and source of the problem. -- jt