Hi Bill,
OK, thanks for checking. I just now checked the MUUG RoundTable and Asterisk archives (for Jan 2013), and indeed, my postings are all there. But, my postings of the last several days have not come back into my Inbox, even though they have previously done so. I haven't recently changed my e-mail system in any way that I can remember, and certainly not in any significant way.
Nonetheless, I do now have a new suspicion. I'm using Gmail as my main e-mail infrastructure (and have been for over half a year) (with my own e-mail addresses at my own domains), and I know all about their "labels" and about unique message ID's in e-mail at large. And, Gmail tries to avoid storing duplicates, simply applying multiple labels instead (elegant! - too bad IMAP didn't think of that).
In the past, my MUUG RoundTable and Asterisk postings did come back into my Inbox, but were identified by Gmail (as evidenced by labels) as being the same messages I sent out. I'm wondering whether, for some unknown reason, these incoming postings now no longer get the Inbox label? But if so, then why?
Hartmut Sager