Answers:
To answer the second sector of the interview, you own to enjoy duplicate encryption as the individual who sent the message and if it is password protected you can't undo it unless the other personality sends you the password.
Try some other email base network site and see if it works. If your internet service provider have email service use it instead.
I tried to encrypt emails convey via my hotmail accounts (using PGP & X509 certificates- some of methods to encrypt mails) but it fail beside message "distrustful vibes from hotmail".
The grounds I could grasp is that hotmail looked-for to added commercial to your mail (when sending messages via hotmail server). This is how they earn money. So they reject encrypt mail since theycan put any advertisement contained by those mail.
PS: - I use email client Thunderbird to access my hotmail statement & those method (PGP & X509 certificates- to encrypt mails) can be done via email client & not through net browsers.