I have had a domain for several years that I used to forward e-mail to a free account I've had for decades. A while back the free account dropped its pop server and became web mail only, so I created a real e-mail account in my domain. The new pop server was simply mail.<domain name>.com:995. I updated the account in Thunderbird to use the new servers (I ended up forwarding e-mail from the old free account to the new one - reversing the original flow). I've just changed my hosting company and have recreated my e-mail account with the new host and updated the Thunderbird account to point to the new servers. I can send e-mail through their smtp server as smtp.<domain name>.com:465 but when I try to receive e-mail at pop.<domain name>.com:995, which their documentation says is correct, I get an error message about an invalid certificate for my free account's old pop server! When I use the alternate pop server name of pop.<hosting company>.com:995, I get my e-mail. This makes the problem not urgent but it is annoying. What I can't figure out is where is Thunderbird getting the old account server name from? The maildir actually still used the name of the old server (pop.<free account host>.net) so I tried renaming it (renamed the folder then restarted Thunderbird and pointed the account to the name of the maildir) but that didn't help. Any suggestions? BTW: I'm running Thunderbird 78.14.0 on Debian/Bookworm