If you are struggling with the Gmail issue and your Gmail is not receiving some emails, so you have to do some fixes, Check if your Gmail server is live or down, Clear your Gmail storage quota, Delete email filters and disable antivirus. If you have already done it. But none of them work in your favour and the problem is still there then you need to configure your Gmail account in MS outlook email client and you will start receiving email on your Gmail account.
See also - https://www.vevioz.com/read-blog/5022_how-do-i-fix-gmail-not-syncing.html