Mastering Office 365 Administration

Connection filter 

There is only one connection filter; you can edit it, but not create a new one. Connection filters are used to whitelist or blacklist IPs from sending to recipients in your organization:

Connection filter

Note that the header for this edit box may say edit spam filter policy, not edit connection filter policy, but don't be confused. We'll cover the spam filter policy next. The edit box is quite different looking; trust us:

New connection filter

The general tab only has the name and description, so use connection filtering ...