@varun-ganesh-d that means that for at least one the unverified users, they provided an email that doesn't exist.
Office 365 mail relay
can someone point me in the right direction as to how to set this up? I got the connector setup on O365, but I cannot see where I can use it, in the admin panel... only gmail...
Thanks and kind regards,
I think I might have found it... in the plugin itself. oops
*its all setup now.