Why is email validation so expensive?

Question

Mail server

Tell me why emails validation services have such a high price?

Are there any pitfalls if you write a check for the existence of email with your own hands? Maybe you need a lot of proxies?

Answer 1

Well, it is the tenth center for one email, it is quite cheap if for business, and if not for business, it will always be expensive.
The main pitfalls are time, effort, programming, servers and verification methods.

Answer 2

Here are the two cheapest email verification services www.emaillistverify.com for 1000 takes 4$ and this deliverbility.com for 10k takes only 5$

Answer 3

I think it's easier to use complex services where search, validation and mailings are available. For example https://snov.io/en/email-verifier