Today a vulnerability in Gmail's handling of the "Reply To" field was out... seems that if an email forgots the character ">" at the end of the reply address, Gmail prints all the email HTML code and so all the sensitive information (such as users data) are revealed.
Now this is not true... an official message from Google (just released few hours ago) said that Mails with the problematic formatting as described above stopped being accepted into Gmail. Previous emails that had this problem will also no longer will be accessible.
A great news... now I can go to bed! 