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On smaller websites I’d be surprised if 1 in 100 of those goes to a person who reads the email sent there.

And on the 1 who does, they get 40 similar-looking emails per day, all of which are scams, and have learned to ignore them.

NOBODY messages abuse@ I had mine on my domains for decades, never got one single email.

Also admin@… or even legal@… I usually check for a "contact us" web page, too.

To 15,000 email addresses? That's indistinguishable from a small-scale spam campaign.

Spread it through hours, days; use mailgun; use a throwaway google groups like spammers do.

At that point you're a spammer.