No matter that I can repeatedly mark posts received as “Not Junk” in either of several ways, from the icon in the menu bar, from the “Message>Mark” drop down menu, and even after adding addresses from posters to the Address Book or the extreme of marking posters as “favorites” the messages go to the Inbox of that account and then are almost instantaneously returned as “Junk”
This happens primarily on one machine (I have two laptops and a Mac Pro I use regularly), a Mac Book Air. All machines are running Mavericks 10.9.x in the current version. All point to the same ISP servers for mail. This particular account is on an Exchange server at Microsoft serving for mail and smtp for my primary mail account, part of a domain I own.
This has been going on for a year, and is now beyond annoying. It doesn’t matter how I change SpamSieve Preference settings, how many times I update the SpamSieve plug-in for Postbox, or re-install it.
The messages it chooses to revert to Junk status are random, but seem to derive from the same sources, and are all opt-in accounts where I have an ID.
Nothing explains this