Did you get this error message from Yahoo, when trying to send emails?
Messages from *.*.*.* temporarily deferred due to user complaints - 18.104.22.168; see https://help.yahoo.com/kb/postmaster/SLN3326.html (in reply to MAIL FROM command))
Well, I’ve got it too. After I searched the Internet, I’ve found this solution:
I’ve just filled the form and now I’m waiting for the response from the Yahoo team.
In the meantime, I’ve managed to set up DKIM and SPF (and without this Gmail doesn’t accept your emails), and my test email just went smoothly and quickly in my inbox. We will talk about this another time.