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This is intentional. It's because the people who own the site know the gmail <realemail>+thisisspam@gmail.com trick and they prevent people using that trick.

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I've fixed this issue at a large company, and it was not intentional, but poorly written regex

Using regex on email is a horrible idea unless there are very well defined blocks - such as only allowing a given top level domain.

Fair enough. I failed to apply Hanlon's razor.

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