amaurymartiny

During the pandemic, I launched [link redacted], an open-source tool to check if an email exists, without sending any email. Not sure what "successful" means here, but I have a couple dozens of customers, which for me is a success.

Interesting, I wrote a similar tool some time ago, in Rust: [link redacted]

I'm using a similar technique to check deliverability, i.e. parsing SMTP responses.

I built an open-source email verification API: [link redacted]. It checks if an email exists without sending any email.

I released the open-source lib some years ago, and built a Saas only this year in April. It started generating revenue (~$100MRR) since September, and I'm not really touching it anymore.

I unfortunately don't know the answer to these two questions.

> mostly

Using Tor, I can verify around ~60% of emails. Notably, the exit nodes can connect to Gmail/GSuite servers. So it's not that bad.

If Tor's exit nodes are blocked by a server, I fallback to Heroku, where I have right now 3 fixed-IP instances. And if I see that one of these also gets blacklisted, I would have it self-destruct and relaunch, Heroku assigns a new IP on each new instance.

I built a tool to check if an email exists without sending any email. I also created a SaaS out of it: [link redacted].

The tool connects to the target email's SMTP server, and parses the response of the "RCPT TO" command. To avoid IP blacklisting, I use Tor.

The code is in Rust, 100% open-source. The core library is here: [link redacted]