I just worked on one of these cases for a company in Pittsburgh Pennsylvania, and it turned out to be three issues:
- the CER file had not been properly exported
- the SECONDARY certificates had not been added to the SSL store
- the proper certificate had not been mapped to SSL
There is a whole lot more to this than just the SmarterMail portion.
additionally, all SSL ciphers are now depreciated and only TLS is allowed, so TLS 1.0, TLS 1.1, and TLS 1.2 must, depending on the capability of the operating system version, have been properly enabled.
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