If you are a facebook mail user, you might have received a mail from Facebook.com stating an announcement that the Email Team Facebook has now decided to end the automatic email forwarding system. It means that if you were previously receiving any mail that was originally sent to your facebook mail ( ie. firstname.lastname@example.org ) on your primary mail ID ( ie. email@example.com ) then from May 1, 2016, you will not be able to do so.
So, it’s better to update your email address that you have currently set to facebook mail.
Here is the text copy of the mail that Facebook sent to one of my colleagues .