I need feedback

There are some grammar errors on the homepage, e.g.

* "Convert your leads to customers using more effective way"

* "Protect servers repute"

* "Get rids of the duplicate emails to contain only unique addresses"

* "We offers 100 free checks while the great service"

One issue I see is there is no mention of security/privacy? Do you store the emails input?

From a quick glance there is nothing throwing me off, which is rare in my case.

Make your special offer more targeted to avoid showing it to the same person N*pages_visited_all_the_way_down.

I don't get the use case.

If I have a file to upload with 10000 emails say, then either they have opted in via an auto-responder and therefore those emails are already validated, or I have purchased a list off someone, which is potentially a bit shady but I should just get them validated again with a double opt in.

Where does this service fit into that?

I don't think I will need it any time soon, but I am impressed by the design of your web page.

The first thing that immediately caught my attention is that it's not using HTTPS by default. More specifically, login and signup are both performed without it. Personally, I won't sign up for or log in to a site that runs sensitive information over a plain-text connection. Changing the protocol manually gave me a warning that the certificate expired at the beginning of September, so maybe that's being worked on.