Aha, some consistent details are emerging.

 

I should add, that Gmail has been making occasional subtle behavioural adjustments even in the half-plus year that it has become my main e-mail infrastructure.

 

(I've been subscribed to Gmail for many years, but I had been using Yahoo Mail as my main e-mail infrastructure for 6 years until I finally got fed up with their bugs and shortcomings, many of which came along in the last two years.  I wrote to Yahoo giving details, but their responding staff were idiots who didn't even get some of my points.  I presume they have more intelligence at their infrastructure end, but still no match for the Gmail experts.)

 

Back to Gmail.  One area of subtle adjustment I've noticed is in the Sent label (I almost wrote folder!).  Current behaviour is, that incoming e-mail does get the Sent label (as well as possibly but not necessarily the Inbox label) if the From field matches any of the valid From addresses I've set up in Gmail.  Yes, even if I didn't send it out from my Gmail!!!  Now admittedly, this is sometimes nice, since I'm trying to make Gmail my entire life e-mail repository (and have imported most of my older e-mails).  I don't know whether this Sent labelling adjusts dynamically on existing e-mail when I add/delete From addresses in Gmail - a good experiment for a rainy day.  And I have yet to figure out the exact criteria for applying or not applying the Inbox label when it decides that I sent the e-mail from somewhere else.

 

(Re forwarding vs. POP3:  I'm forwarding my many marityme.net addresses to my Gmail.  I am POP3'ing a few non-marityme.net addresses of mine.)

 

So, could all this be the cause of our problems, possibly with a recent Gmail behavioural adjustment?

 

Hartmut Sager