The ACTUAL deliverability is what I'm most interested in, but you NEED to allow us to parse data by more than country. At least city or county!

I'm also unclear on how to use this product in the sense of if I save some of these leads in my going to accidentally save them again later or is there some mechanism to prevent me from doing that?

Also this really needs a bit more refinement on the search criteria. You will allow us to put in positions, but it really would be good to allow us to put in a search criteria for the type of business. So for instance, if I only want to work with cosmetic Dentists, as opposed to regular dentists, I should be able to add that modifier.

Using Clearout, an email verification service (Purchased via appsumo), a I pulled revealed these numbers:

Total 3,145
Valid 1,698 (54%)
Invalid 781 (25%)
Catch All 552 (18%)
Unknown 110 (3%)
Duplicate 4 (1%)
Syntax Error 0
Disposable 1 (1%)
Free Account 348 (11%)
Role Account 28 (1%)

NOTE a few things:

1) They give you a number of email addresses for some accounts, so if I took the time to sort through those too, you MIGHT see higher numbers.

2) They seem to offer an email validation service (I've not checked that)

3) While the numbers feel a little sad (25% invalid!? Another nearly 20% catch-alls and duplicates), that's still a solid 1500 people to reach out to, using only 1/2 of my credits thus far this month. If I can get 3k emails per month that are valid people I want to speak to, that's a pretty big win...

Time will tell how good these are (and some of that depends on my approach, to be sure), but I see no good reason that I SHOULDN'T be able to turn that in to gold!

So, I'm FAIRLY happy with this, but I use a LOT of services that are similar, and this SEEMS to deliver a reliable ENOUGH service, but it's still a bit rough around the edges.

I'm not sure how often they validate their data, and where they're pulling from, etc., but seems like a decent investment.