How to add a Facebook account to GMail?

Question

Facebook

In the settings of the GMail mail account, there is a function for collecting mail from other accounts, but when I add the postal address of my mail on Facebook, the following comes out. message: "Error connecting to mail.facebook.com."

Answer 1

Was this possible in theory?

Answer 2

I have everything that came to Facebook automatically leaves with a letter not a gmail.
because on fb account mail - google