IPhone 6+ refuses to send s/mime encrypted e-mails

Hi,
i am experimenting with s/mime encryption of e-Mails on the iPhone 6+ ios 8.1 and got as far as being able to send signed e-Mails, but not encrypted e-Mails from the iPhone.
Encrpytion fails with the message "Verschlüsseln nicht möglich" (encryption not possible) in the e-mail header without telling me why this is not possible.
Here is what i did:
-in addition to my existing e-Mail accounts i created an iCloud e-Mail account.
-for all accounts i got myself free Class 1- certificates from StartSSL.com.
-i added the certificates to my mac osx 10.6.8 and os x 10.9.5 keychains
-next i downloaded the iPhone configuration app v 3.5 (289) from Apple to my desktop mac running os x 10.6.8.
-i noticed that my keychain app shows the iPhone Configuration Utility certificate in red as not being trustworthy - i verified that i downloaded the latest version from Apple (support.apple.com/kb/DL1465) - i ignored the warning
-i connected my iPhone 6+ via usb cable to my mac and installed the certificates on the iPhone - i can see new Profiles with a green tick on the iPhone.
-i turned s/mime on (+default signing +default encryption) in my e-Mail account settings on the iPhone.
using Mail (os x 10.6.8 + 10.9.5) on my desktop macs i am able to send signed+encrypted e-Mails between my accounts.
I am also able to read the encrypted e-Mail on my iPhone on the non-iCloud accounts (i see the blue tick + blue lock). Trying to reply from the iPhone with an encrypted message results in the error described above - cannot encrypt.
Sending a signed+encrypted e-Mail to my iCloud account from one of my desktop macs makes it disappear in Nirwana - it is nowhere to be found. I also do not receive any returned message about any failure - i tried to send from securesmtp.t-online.de and smtp.gmail.com + another smtp server from Belgium - same result.
i turned iCloud keychain sync from off to on, thinking it might have something to do with the problem - same result.
thanks for any tips
Peter

i finally figured out the problem:
i thought that the public key would get installed automatically when receiving a signed e-Mail as happens with Mail on the desktop.
This is not the case. On the iPhone I have to click on the signature or lock of the received e-Mail that contains a public key. Then i need to open the received certificate and press the install button. That done, the public key is on my iPhone and i can return encrypted e-Mails.
This also means that the iPhone Configuration utility is still working for iPhone 6+ running ios 8.1 and that the information from Apple support, that i need to use the new Apple Configurator utility is wrong.

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