improved email client support for encyption

Use of encrypted SMIME email is not very common. It is largely because of poor email client SMIME support.

I would propose Comodo use some of their resources to help open source projects improve their support for SMIME. As more users use SMIME, more email certificates will be purchased from Comodo.

For example, helping with the implementation of this feature:

feature bugged and need revo !