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I can attest to the unstable handling of '+' suffixed emails. UPS allowed me to ship a package as guest with myemail+ups@gmail.com but wouldn't let me create an account with the same email ID. I had no way to track the package pickup onwards.

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Can confirm; once signed up as foo+bar@example.com, everything worked (including the confirmation mail)… and then the address was automatically normalized (‽) as foobar@example.com and I could no longer receive any mail (since that's a different account altogether).

There's also the unstable handling of . symbol (dot or dots) in email address before @ symbol. Gmail allows dots in email address before @ and normalizes them, so the same address with or without dots works. This leads to funny behavior such as unlimited account creation with the same email address (yes, + symbol would also work for this but that works almost everywhere and is better known) or my wife thinking she does not have an account while she does, creating a new one instead.

> unlimited account creation

Nice, hadn't thought about :-)

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