secure pop warning

Hi, when I try to use secure pop in outlook express I get the following warning:

"A Certificate chain processed correctly, but terminated in a root certificate which is not trusted by the trust provider"

I have an i n s t a n t s s l certificate.
It works fine after I click yes, and I know I can have outlook express to trust the cert but I was just wondering if I'm supposed to get these warnings in the first place?

I don't have these problems with thawte certs.

 

 

 

 

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