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"LLL@" doesn't map to "LLLLLLLL@" in any logical way. "lll@" does; that's just a silly argument.

The only reason "LLL" and "lll" mean the same thing are because currently email addresses are (sometimes) case insensitive.

In a world where email addresses were "obviously" case sensitive, "LLL" mapping to "lll" would be just as crazy as "LLLLLLLLLL" mapping to "LLLLLLLLLLL".

They just seem similar, to humans. But they're different strings.

It also maps to 111@ and III@, depending in font

By maps to, they mean it counts as the same email address. 111@ and lll@ do not do that. The font has no impact on the email spec. However it can add extra confusion.

I doubt anyone is crazy enough to implement the email spec for comparing emails, to be fair. I would honestly be surprised if any publicly available mail agent or server supports that craziness.

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