Well if you want to use gmail on N9 in 2017 then you should
change the settings in your gmail account.
Go to the following link and change the settings to
Access for less secure apps > turn on
https://www.google.com/settings/secu...anexp=lbe-R1_C

And in your N9
go to accounts
add accounts
Choose "Other mail accounts"
Write your username (example@gmail.com) and password
tap on manual setup
choose imap4 or pop (i used imap4 with server imap.gmail.com)
SSL secured at port 993

outgoing server
smtp.gmail.com
SSL secured
465 port
authentication plain password.
and then you can reccieve and send emails through your Nokia N9.
Hope this helped someone.