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But not every website out there allows you to enter this as a valid email address.

My earlier hypothesis was that this was on purpose, to make sure you don't use a filter on any email they might send. But these days I'm tending to think it's just a bad regexp on their side.

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Even worse, some sites let you enter a plus address initially but that address will not work in some account management pages. I had an instance where I signed up to a pizza place with such an address and I could not unsubscribe or edit my mail preferences because of it.

For example, overstock.com. Their registration page lets you use '+' address, but their login page forbids it.

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