Create an open relay recieve connector

[Brad G. - AdvenTech]

- Create connector
- Assign only anonymous permissions
- Bind IP

You must run this command after creating the connector

Get-ReceiveConnector "Anonymous Relay" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "Ms-Exch-SMTP-Accept-Any-Recipient"