Outgoing email issues

[Alexander.]

I have Cloudflare set up to relay with Google Workspace. No server changes have been made, and recently emails (outgoing) have stopped working on the Admin Panel, showing the following error message. I did reply to this post here, but I do not know whether it's entirely related. I am running a VPS server with cPanel and WHM access.

 

[phucvandinh]

Just unchecked this in the email options in admin

 

[Suzanne O]

Do a check with your email provider