Receiving problem with yahoo mail server?

My email received perfectly with Gmail but yahoo doesn’t receive emails?
how can solved this problem?
The score of this mail server in https://www.mail-tester.com/ is 8.9.

Verizon (Yahoo!, aol) is as troublsome as Gmail and Microsoft can be.

Do you receive any feedback in the mail logs? I would check there as well as check that your IP is not on a blacklist.

You may need to resort to using a SMTP relay …