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I usually give an email of the domain I'm visiting, e.g., WEBMASTER@nationalgeographic.com or GET-STUFFED@nationalgeographic.com, etc.

I prefer abuse@nationalgeographic.com as that is the address you are supposed to use to notify a domain that they are unintentionally sending spam.

One of the best things I've ever used on the internet

I have no problems giving out my email, potus@whitehouse.gov