I decided to hold of one more week before going back to the lesser sights, as I have been aqsked a lot about replacing Rapportive, so here we go. Since Rapportive stopped allowing us to validate work emails, people have been trying to find a replacement. Here is a list of some tools that can help. I will use a list of possible email addresses that I came up with for a person utilizing an email permutator spreadsheet I created.
VIBE- see picture below for results from Vibe
As you can see everytime you hover over a possible email address the little vibe sign appears, and since I was over the first one I chose to click the vibe icon and you can see the results.
Connect6- see picture below
In this case I highlighted the second choice and as you can see in the upper right connect6 says no.
Other tools that can work are Monki gmail extension, and Sellhack.
Of course you can just take each email possibility and test them in the sites below
In addition the list of sites below can help
Hope this helps