Contact email search is case sensitive

[arikb]

I apologize in advance if it's a dup. The closest is probably #389.

If someone went all fancy and camel-cased their email address in their OpenPGP identity, for example [email protected] mail received from the user [email protected] would not be identified correctly as having a contact and public key, and would not be sent securely when hitting the "reply" button.

A workaround is to remove the recipient after hitting "reply" and re-adding it, resulting in a successful work-flow.

[felixhammerl]

Project is on hold, see: #405