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Comment of note:

n@ai is also a valid email address. Owned by a guy named Ian.

I bet that fails all email address validation code

“Falsehoods programmers believe about email, volume 2022”

earlier this week a website wouldn't let me create an account with my spam@mydomain.com address, but I could use myname@mydomain.com.

Do they think spam bots have emails with spam in the address? Do they think I won't just filter their spam by sender if I can't buy recipient?

“Spam” is also a (rare) surname.

I run into this a lot too

"All models are wrong but some are useful" probably applies here.

s/model/email validation code