How to get the Email of someone who just registered a domain?

Question

Domain name market

Hello!
Yesterday I bought a domain and after a while I received a letter from the web studio.
The letter indicated my domain and their services :)
I understand that they could find out my email through whois.
But how did they do it? Parsing domains of certain zones?
If you have a script, please share :)
Thank you!

Answer 1

1. https://www.whoxy.com/newly-registered-domains/
2. https://whoisds.com/newly-registered-domains
3. domains.ihead.ru/domains/new.html
4. domaindata. biz (full domain data samples)

Answer 2

The registrar leaked the info.

Answer 3

The registrar passed, I think. Perhaps this web studio pays him a small bashish to feed her the contacts of those who just bought a domain ...