We have found recently that if you have not removed the Received: headers and other extraneous headers from the messages AND if you do not have Notebook-Header= Full set in the list header, the Date: header must come first in the message. If Notebook-Header= Full then this constraint does not apply. I was still in the process of testing this thoroughly before updating 8.10.3 of the site manager's manual and I have not been able to complete my tests, but this does appear to solve the problem if you can't easily rearrange the headers in your non-LISTSERV archives when porting them. Nathan