[Typo3] S/MIME encryption in mailforms

[Fabian Langheim]

Hi,

I have a question about mail-encryption in TYPO3.

We need to encrypt all outgoing mails(to the owner of the site) from
mailforms (of a single TYPO3 installation) with S/MIME.
Is there an extension that makes this possible?
If not, does anyone know if the ext:mailformplus has its own mailfunction
(that we could safely modify) or if it uses a core-function of typo3?

regards
Fabian Langheim