[Users] Certificate pop-up message

[John Jason Jordan]

Claws Mail version 3.8.1 on Fedora 16, x86_64.

I have three accounts, two of which are pop (Comcast and Gmail) and one
imap (university account). I have Claws Mail set to check all three
every three minutes. One of these accounts has an out of date
certificate (and I can't figure out which one) that will probably
correct itself in a few days. In the meantime, I am getting a pop-up
warning about the invalid certificate every three minutes. The pop-up
appears on top of whatever I am working on at the moment (LibreOffice,
Firefox, etc.), forcing me to stop working to close it. I click on
Accept and Save, but Claws Mail continues to pop up the warning. 

How can I tell Claws Mail I really don't give a rat's patootie about
the certificate and to quit bugging me about it?