No, the proper response to this is to fork out more money for a certificate that is more widely supported! It's email, it should be secure / trustworthy?

Disabling SSL is even worse - there is no way I'm going to trust someone with something as important as my email if they don't offer SSL or can't get it right.

This might be an issue with - "purchased certificate must be combined with a root CA certificate for it to be trusted by browsers", see https://devcenter.heroku.com/articles/ssl-certificate i think it is an nginx thing? And definitly do NOT disable ssl

Works here with 20.0.1132.57 under OSX 10.8