Encrypting email?

I have S/MIME working fine for encrypted/signed email messages sent from my imac (10.8) to my iphone 5 (latest IOS).
No problem.
I have GPG Tools on my imac.
I have a free comodo email cert (now on my imac and my iphone (both keys)).
However, I can't send S/MIME encrypted/signed emails from my iphone to my imac.
Not sure why.
When I open a new email form on the iphone, it says Encrypted at the top.
As soon as I choose a To email address (even my own, the one tied to the cert), it changes to Not Encrypted.
Does anybody have any clues?
Comodo does not.
However, maybe this is relevant:
On the iphone, in the Profile area, under Settings>General, for the comodo cert for my email account, it says NOT TRUSTED.
It was installed 1/1/2014, and it is definitely comodo's cert.
Again, I have no trouble decrypting email, but cannot encrypt email on the iphone.
Thanks.
Mac

http://www.cfuze.com displays a
holding page.
Is there anywhere else that explains how to encrypt mail
(MX7)?

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