I use IMAP & Gmail on a variety of pc's, iphones and mac's. Of course one functionality that I love is deleting an email from one platform and instantly seeing it delete on every other platform.
I'm using the latest version of thunderbird on the 2 PC's and Mac. I've confirmed that Thunderbird's settings are exactly the same across all 3 machines.
The problem is that on one of the PC's, and just that one PC, email which has been deleted at another platform continues to be displayed. Clicking "get mail" does not get rid of the already deleted mail. But restarting thunderbird will display everything up to date (ie, the deleted mail is finally gone).
If I delete mail from the effected PC, it is properly updated on all the other platforms.
The "other" PC functions properly in this regard.
I'm stumped, so I'm beginning to think that the issue isn't thunderbird configuration (which is simplistic and easy to confirm is identical on all platforms), but rather the firewall on this one machine that is malfunctioning.
Can you test to see that clicking Get Mail on the affected PC does in fact get any new email? Maybe send yourself an email from the Mac while Thunderbird is open on the affected PC, and see if it shows up without restarting Thunderbird.
(1) create and send email from mac. It appears on both mac and pc (without clicking "get mail"). I delete it on mac. It remains on PC. Click "get mail"... the deleted email is still there. (and will remain there forever, unless I take the next step). If I shut down thunderbird and restart that email will be there momentarily until the server is checked and the inbox is updated... then it disappears.
Here's another slightly different trial:
(2) create and send email from mac. It appears on both mac and pc (without clicking "get mail"). I delete it this time at the PC. It disappears on the mac. Exactly as it should.
Reinstalled thunderbird .... no change to symptoms.
Not sure what "autofix" function you're referring to, but I have some auto scan / fix function already set up.
It's sure a strange problem .... the Inbox (only on PC) is synchronizing to find new email just fine, but is not getting the message that an email has been deleted.
If that doesn't work, right click on the icon in the taskbar and "Disable Smart Firewall" choose 15 min or so and repeat your test.
If that works, go into the smart firewall "program control" and change thunderbird from "Auto" to "Allow".
If that also didn't work, try turning off "Email Protection" (it only works for non-ssl POP3 mail anyway).
On the main screen click the "advanced" button, turn off the slider for email protection.
If you hover over the words "Email Protection" another box will appear that you can click "ignore" to ignore the warning and keep the main icon "green".