Hey there, one of my customers is asking for a webmailer that supports digital signing and PGP/GnuPG encryption of mails. As I saw there is an open ticket for a roundcube plugin on this, but up to now there are only some technical thoughts on how to realize such a plugin. Do you know a (usable) webmailer that supports those features?
The problem is the private cert. It needs to be available locally on the client that encrypts the mail. In case of the a webmail app the private cert would be hosted on the server running roundcube. That is the obstacle they have not overcome. Alternatives are not there yet. I hope the Roundcube Team will make some progress in this direction. There is some chatter in the dev mailinglist. You can subscribe on the roundcube homepage.