Folks,Thanks for the responses. They seem to all same the same thing: multiple message id's are not a factor in modern email (if they ever were.) So I'm going to remove reference to them from the email-arch draft.
d/ Tony Finch wrote:
On Sat, 1 Mar 2008, Dave Crocker wrote:The email-arch specification notes that Internet standards provide for at most one Message-ID, but the document asserts that more than one sometimes appear in a message. I put that in because that's been my impression.Arnt's comments agree with my experience. RFC 2822 provides for an additional resent-message-id each time a message is re-sent. Tony.
-- Dave Crocker Brandenburg InternetWorking bbiw.net