Email is good.

A blog ostensibly about email productivity by Chris Coyier who you can email, obviously, at chris@coyier.com

What is a valid email address?

A quiz by Sam Rose.

A quiz interface displaying question 6 of 21, showing an invalid email format with the text 'what_about_spaces@example.com' and an error message about spaces. Options for 'Valid' and 'Invalid' are presented, along with a 'Next Question' button.

It gets weirder the further you go. Like:

Did you know emails could have comments? Anything (in parens) is a comment. Introduced in RFC 822, but made obsolete by RFC 5322.

And you can use square brackets to provide an IP instead of a domain??

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