We’re getting emails with “firstname.lastname@example.org” or “email@example.com”, but do not have no-reply as a mailbox. Is there a way to say anyone without a mailbox with our domain reject as junk or spam? I am currently running Microsoft Exchange 2013 and have Symantec Mail security for exchange running, but it still seems like there’s a lot of invalid emails getting through. I know in previous version I saw there seemed to be a more clear way of doing this.
I think you want the following
Set-RecipientFilterConfig -Enabled $true
To enable filtering, then
Set-RecipientFilterConfig -RecipientValidationEnabled $true
To drop anything for an email address that doesn’t exist.
*If this is on a server that doesn’t include the edge server role you will need to install the agents with the following command