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I think to know that you can query some info from a mailserver to test if an address exists.
Yes, vrfy
- https://manpages.debian.org/bookworm/vrfydmn/vrfydmn.8.en.html
- https://manpages.ubuntu.com/manpages/jammy/man1/vrfy.1.html
- https://www.oreilly.com/library/view/postfix-the-definitive/0596002122/re29.html
For Postfix the default of disable_vrfy_command is : no So I assume you can try it risk free.
The web link in this post gives a 404. Correct is https://sga.codeberg.page/articles/Launcher/Launcher_for_Everything.html