[Hall of Famer]

Found the answer for you:

Originally Posted by bkc56

Yahoo has implemented new DMARC security policy that requires all e-mail sent from a Yahoo address (like using Gmail’s Send Mail As option) to actually come from Yahoo servers or it must be rejected. See: https://productforums.google.com/d/t...DUY/discussion Yahoo help article: https://help.yahoo.com/kb/mail/SLN4075.html

So it appears that the issue is with yahoo email. Do you have another email with a different provider like Gmail, Hotmail or AOL Mail? If so, Try changing your admin email to any of these and see if the issue persists(you need to go to ACP/Settings and change admin contact there), at this point my conclusion is that yahoo's new policy is the cause of this problem, as you cannot send automatic emails with a yahoo email.

Anyway, I wouldnt recommend anyone to use yahoo emails nowadays, its bringing a lot of pains to users, and lately they even randomly block your access if you have adblock plus installed.

Source: https://productforums.google.com/for...il/Iy99T8PhJbc
Read more at: http://blog.returnpath.com/all-about...-reject-policy