To re-iterate what I've said in the past: I have pretty strong opinions on this. I don't believe list management software should *ever* be changing the message IDs.
As I understand, this was originally done so that gmail users would see their own messages. Perhaps the response here is to instruct people on how to configure gmail for this behavior (since it affects much more than just a particular mailing list). (The easiest way is to write a catch-all filter rule that then does nothing. For some reason this causes the sent message to remain in the inbox instead of being moved to Sent).
With this change, however, something changed about the defaults. I have users now complaining that they are seeing their messages twice, and we had previously configured things to never send messages with changed message IDs. Did something change about the default or configurable behavior in this regard?
Thanks,
David
David Brown