thunderbird sieve certificate issues

[Marc Grober]

I have thunderbird sieve extension connecting to my mail 
server,  but the extension then advises that the server is 
requiring a certificate. Though I have a number of Thawte 
email certs none of them will of course be accepted and the 
extensions say they are unable to establish an encrypted 
connection.  What is causing this and what can I do about 
it?   Is the server looking for a public key? Does anyone 
having this running also being asked for a cert? I looked 
and played with OCSP. And it seems I can get the server to 
quit asking for a cert but then it just hangs there saying 
"Connecting".  Is the certificate just a red herring?
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