Encrypted email in iOS / exchange domain

hi,
i'm using encrypted email time to time on my PC using outlook 2012 and a smartcard.... fine
my iphone is set up with this exchange account... fine
I was not able to read encryted email (normal!) untill i've exported my certificate to the iphone.... good !
but now:
when the certificate is active: i cannot distinguish encrypted email from non-encrypted ones; and if I forward these encrypte email, there are not crypted anymore...
so if I activate s/mime in the exchange account on ios, then all my email all encrypted....
how can I toggle easily between encrypted and encrypted ? as I can do it easily on my PC outool ???
I don't beleive it' s not possible on iOS
thanks
cyril

well to solve the musti system problems you can simply use this apps :
http://vladalexa.com/apps/ios/txtcrypt/
you can only encrypt texts but very easy to use and no certificate problems to set ...

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