My solution without messing with any other plugins or wordpress’s native files.
Quoting TrueTone’s post
I logged into the server control panel and deactivated mail on the account and the messages then started getting through. I hope this helps someone.
and AlexMearns’
Truetone mentioned he had solved this problem: “I logged into the server control panel and deactivated mail on the account and the messages then started getting through. “
Truetone can you explain this or can someone else explain how to do this?
For me, under the DirectAdmin settings (thats what my webhost provides as control panel), go to Email Management -> MX Records, and uncheck the checkbox that says “Use this server to handle my mails”.
See screenshot here.
For cPanel, its probably under Mail->MX Entry->Email Routing