Jerry Peek writes:
>- it keeps the last 500 (I think) Message-IDs sent to each list, and
> also sent to listproc itself (administrative requests). If a new
> message comes in with the same Message-ID as a previous message,
> listproc routes the message to the list owner or system manager.
>- it computes a checksum of each message body sent to a list.
In this case the headers were different for each message, with different
times and message ID's. The actual time at which the message was
submitted was the same of course, but all the other times for transfer
between machines were different. This was not an SMTP problem after all,
this was a problem with the queueing in Microsoft Mail I guess.