If you’re facing a yahoo mail not received issue, look into the following common causes:

Unable to Connect Type of Authentication is Incorrect: Your Yahoo accounts may be unable to receive emails due to authentication procedures such as SSL for incoming emails and TLS for outgoing emails. Check that these protocols are configured correctly, and if there is a problem, fix it as quickly as feasible.

Examine your filtering options: The majority of Yahoo customers have issues as a result of email filters that have been enabled on their accounts. Such issues might cause emails to be sent to the trash or spam bin instead of the inbox. So, before you use any approach, double-check the account filter settings.