Mail.app suddenly can't read POP using SSL, but Thunderbird can

Hi all -
This afternoon, my mail configuration stopped working suddenly. I'm using Mail.app under 10.5.6, reading my mail from my own domain host, which is on a shared server managed by my hosting company. I read my mail using POP, SSL encrypted. This has worked, stably, for a very long time. Now, POP + SSL fails to connect. Disabling SSL makes it work. Setting up an IMAP account for the same domain works. Outgoing SMTP mail using SSL works. But POP + SSL doesn't. I set up an account in Thunderbird, just as a sanity check, and that account DOES work using POP + SSL. Then I set up an account on my wife's Macbook running 10.4.11, and it DOESN'T work with POP + SSL, and does work with POP without SSL.
(When I reboot and start Mail.app, I get the familiar, "Untrusted certificate" dialogue, because the hosts mismatch: my host is www.myhost.com, but the certificate is issued for the machine that the hosting company uses to host my domain and a number of others, host789.hostingcompany.com. This has never caused a problem for me, and I have no reason to believe that it's the problem here - I get the same dialogue under Thunderbird, which works fine.)
I'm assuming that something odd has happened on my domain host. The certificate was issued on 3/11, which is recently enough that I can imagine that I'm seeing the new certificate for the first time (maybe I'm grasping at straws here). In any case, it's gotta be some way that Mail.app is cranky about SSL that Thunderbird is not.
I've got a help ticket submitted to my domain host, but I doubt they're Mac experts. So my question is: can anyone think of anything that they might want to check out which may account for this sudden change in behavior? Disabling SSL permanently is not an option.
Thanks in advance.

And just in case anyone asks, yes, I checked my mail account settings carefully with my domain hosting service and the settings appear to be correct (or, more to the point, there were some minor differences which I corrected, without any improvement in my situation).

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