It is claimed that Versamail 3.0 on the Treo 650 works with SSL certs both from a ca and self-signed. I don't know, I only have a 600. But, on that basis I'd expect the API is capable of doing it. I have no particular insight into what the 650 is looking for. If I ever get one, you can be assured I will look, but $600 to find this answer is right out.
VersaMail on the 650 failed with the same server-side error that Chatter fails with for me...
Alec
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