If you would like to share your email with another user without the entire site seeing your email address, you can make a post on that users page that includes your email and we will hide the email address from the entire community except for you and the page owner.
Everyone except for you and the wall owner will see the following:
This will also work on comments in the same post to another's page. If you do post your email in a regular post that is not a wall to wall post, it will display to everyone. Posting your phone number on another person's page will also be masked.
If you have any questions about this feature, please feel free to contact Support here.