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So you are one of those sites that reject email addresses with "+" in it?

That's a less than ideal solution. As another comment mentioned, you are screwing over legit email addresses with things like +. Better is to use better tooling. For sending email, I would use SendGrid or an alternative.

someone123@example.com is not amused. Might as well say "we throw out every e-mail that contains the letter 'b', because Reasons. Makes us feel warm, fuzzy and secure."