In my Android 4.3 Samsung Galaxy S3 there is a builtin Email App. If i open the account configuration there is an option to sign outgoing emails.
Configure Email Account > Security Options > Sign outgoing Emails (check)
Below is another item called PRIVATE KEYS. If i open it, it shows an empty page. I can click Menu>Import Key and it shows me another empty page.
I have S/MIME certificate signed by a trusted root CA (StartCom) and i copied it via USB to my phone. The file is a "filename.p12" file maybe this is the problem but it worked for outlook on my computer.
How can I add my private key to my email accout to be able to use the "sign outgoing emails" option?
Please help me, i am struggeling around since hours. It cannot be the case that nobody used this option before.