There are two main ways to serve a notice to quit.
A process server or professional service company will actually serve the tenants with the notice. The problem with this procedure is that if the tenant knows that they are behind on rent, then they may not be easy to find.
The most effective way to serve a notice to quit is to send the notice via certified mail with a return receipt. After this is done, the notice to quit is posted conspicuously on the property, such as on the front door or garage.