Follow the instructions listed below to rapidly determine the cause of this and if a problem with your account or the sender’s account is keeping the messages from arriving.
Block domains in Yahoo Mail for desktopBlock domains in iOS and Android Yahoo Mail app
Spam folder – Check your spam folder to see if the email was incorrectly marked.
Use filters to organize Yahoo Mail – Yahoo Tech Support ExpertsCheck if your account has any errors
Send yourself an email by logging into your Yahoo Mail account on a computer.
If this occurs, you must first log into your Yahoo email account in order to start receiving an email once more.