1. Log into your mail server admin portal and select Admin.
2. Select Exchange.
3. Select Connection Filter (beneath the Protection heading).
4. Select Connection Filter, then select the Pencil icon to edit the default connection filter policy.
5. Under the IP Allow list, select the + sign to add an IP address.
6. Add the Perimeter81 static address to your Allowed IP list.
7. Select OK, then Save.