I have 2 tenants who stopped responding to any communication from my side.

As a listing agent, there are multiple ways to communicate this to buyers of your property.  

I had a similar thing, but posted the eviction notice (it is not banned where I am) and between when she stopped paying rent and communicating and moved out, we did an inspection, but the last few weeks she did a lot of damage mostly filthy (disgusting would be more accurate).On the plus side, they are out and you can rent it to someone else-who knows maybe market rent has gone up.  

Problems between landlords and property managers are usually based on communication.

Certified mail should do the trick but at least one other medium of communication would be a good idea.Best of Luck!

After several attempts to communicate with him I finally found that the wife's name should have been on the lease and there was a typo.

And of course good communication.

Joe,I do not have words to express my gratitude for your comments, they really mean a lot.

Looking forward to connecting and communicating with outstanding and already successful investors to gain more knowledge.

Of course, communication is key and tech allows us to video call as well.