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I need to cancel a car rental reservation I made with europcar.com (which is cancellable for free according to their T&C!). - When I try from the website it fails because the email I used has a + in it, they have some bug in their server-side URL decoding and it gets converted into a space

Use percent encoding for the + sign ? If you really think it gets converted to a space. Wouldn't be the first time to encounter systems where signing up works with a + in the email but some secondary system (support, payment, shipments) give an error that the email is invalid 😔.