So, even though InstantSSL claims it is supported by "MacOS X", it appears what they *really* mean is that it is supported by web browsers in MacOS X.
Ahhh.... I finally got it to work, but I don't think this is the "ideal" solution....
At least for MacOS X and it's Mail application, if I install the root bundle from InstantSSL into the System keychain, it then will accept the cert offered by QPopper.
I downloaded this file:
http://www.instantssl.com/ssl-certificate-support/cert_installation/ ComodoSecurityServicesCA2018.crt
Then, in MacOS X Finder, I just double-clicked on the file. It opened the Keychain Access application and offered to install the certificate. I had a choice of user or system, and I chose system so it would cover any user of the machine.
Once that was done, the Mail application had no more problems.
----- Steve Palm --- [EMAIL PROTECTED] Computer Systems Analyst/Programmer Slavic Gospel Association -- Loves Park, IL
