Mail - Constantly asking me to verify server certificate

Hey guys, I'm new here. Hope everybody's well and hopefully somebody can help me!
I've recently bought a domain name and have created a couple of email addresses. I set them up through Mail and they were fine for the last couple days, until now..
I keep getting asked to verify my mail server certificate? I've already clicked "always trust" a fair few times, it prompts me to enter my administrator password and then seems to work. Only recently it's been asking me for this password twice.. as in, I'll enter it, and then it will ask for it agian INSTANTLY, as though I'd entered it wrong or something.
Here's a screenshot of my problem:
http://img179.imageshack.us/img179/9245/picture6xv1.png
It's becoming very frustrating, and everytime I quit Mail and relaunch it asks me to verify the certificate again.
Is this a Leopard problem? Or something to do with my hosts?
Any help is really appreciated.
Thanks
Felix

I had this problem. I solved it by making two separate self-signed certficates on my server. (It used to have only one.) Then I assigned one vertificate to SSL for SMTP and one to SSL IMAP/POP.
Mail.app now remembers to trust these certificates now, simply by clicking "Always Trust" (whatever it was) as one expects one should. Once when first receiving email, and then one more time for sending email (for the SMTP).
My Mail.app is configured to send and reveice through the same server but receive from mail.myserver.com and send to smtp.myserver.com.
It doesn't seem to matter what I called the certficates. I just names them "MyCompany Mail" and "MyCompany SMTP", and assigned them to POP/IMAP and SMTP.
It actually made sense that Mail.app would forget my trust setting for the certificate for mail.mycompany.com when I later trusted the same certificate for smtp.mycompany.com.
Maybe this helps some of you!

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Mail - Constantly asking me to verify server certificate

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