Hello. I have used Wireshark to analyze traffic and I can see the name of the e-mail (firstname.lastname@example.org). Is it possible that the plugin can also encrypt this data?
That account / login information is used by the MSN protocol. There's no way for the plugin to encrypt that data without breaking compatibility with MSN. The only thing that the plugin can encrypt is the message contents itself. It then sends that in such a way that MSN delivers the encrypted contents to the person you're chatting with.