I used this to provide the possible new addresses to my process server.

What I did early on that helped is I would install a drop box or mail slot in a closet for rent.

Push the master key tool in the slot you will hear a click.  

I was looking for something that would give me slots for three things: Labor Cost.

The difficulty will be serving them without knowing a forwarding address for them (which they know I'm guessing), but you can hire a skip tracer, process server, or often even the sheriff's office to help with this service. 

Unless you're tech-savvy and can set up a server for everyone to remote into...

He's not interested in a slot in an RV park. 

I also did the prior advice and booked 15 minute slots which did work out so I didn't have long wait times.  

Also, I have had issues in the past where the company I sold for shut down unexpectedly and had bad tech support for email servers, so that's a no go.

After he had sent over the appraisal website to place an appraisal order to "Lorenzappraisal.com" I looked up their website registration information as well; they too were registered only in December and are using the exact same host, the exact same domain registrar, and the exact same name servers.