Thank you quicksilver8; however, I do not see any of my specific issues in that area.
To clarify: on the account that is not downloading the messages: I'm not getting any error whatsoever. Connection doctor says it is logged in & connected (green dot) & although I get the spinning wheel for a long time, I never get any error symbol (triangle or tilde): it just posts the number of unread messages, but it has not updated anything from the past week or so.
The outgoing on the other account has suddenly started working (it seems), although without any indication as to why it stopped in the first place. Not exactly confidence inspiring.
Any suggestions would be much appreciated, though I suspect I'll have to go into the store for this one.
ps. "rebuild" is also greyed-out for that particular account (that won't download messages). Not sure what that is about, perhaps related...
you mean under activity monitor?
it fires right through authentication, but I get the "blue-stripe" bar when it hits "retrieving" or "fetching" messages - but it never returns an error. It goes on to say "adding messages", but nothing happens, it just restarts: log-in, authenticate, copy messages / fetch messages <time passes>, rinse & repeat.