I am not receiving my email.What should I do

Check your e-mail account configuration in Settings>Passwords& Accounts, calling your e-mail provider (gmail, yahoo, etc).

See also this support guide:--> If you can’t send email on your iPhone, iPad, or iPod touch - Apple Support

Regards

Giulio

Why are you not receiving email? Do you see an error? Do you have your mail account set to fetch mail, or if on Manual, do you open the Mail app? You are going to have to provide more information.