Whenever you can't receive emails on the Gmail account. it means, there is something wrong with the user account on the phone. Here are the guide to fix the problems. 

1. First of all, you need to check the mail settings. make sure that the mail filters are working perfectly. 

2. Go to the account settings and delete the forwarding settings from your account as well. 

3. Sometimes, Gmail is not receiving emails because of the incorrect username or password errors. So you need to remove the account and then re-add the mail application. 

4. Let's go to the playstore on the Gmail and update the mail settings. if Gmail is showing some kind of errors. now you need to update the Gmail account as well. 

5. Sometimes, Gmail is not receiving emails because of the server settings. so you need to make sure that the Gmail is working perfectly fine and it can reach to the Gmail servers without any interruption. 

So these are steps to fix the Why am I not receiving emails on the Gmail. in case, if you need more help. you need to visit askprob blogs. there you will find the complete guide.