Simple to use, type =VerifyEmail in a cell and you will get results. It's useful for a manual marketing/sales tasks.Cons:
200 free requests and then 50 every month, but pricing is good.
I had a list of 150 email addresses of journalists i collected manually for a couple of weeks. Just verified them all.Lu Milevskyi has used this product for one day.
The most simple product that brings value, i saw this year.Cons:
Don't see any.
I live in Google Spreadsheets! Happy to find such a good tool that supercharges GS.Vas Vaskul has used this product for one week.