They often try to get you out of it though, e.g. will reply with nothing but an attachment which is an image of their typed non-proxied email address they want you to use. (I guess Amazon filters it or tells them off if it's typed in the body of the email.)
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Amazon merchants can't get the email, it always goes through an "email proxy" aka an email that amazon provides to them, in your name
They often try to get you out of it though, e.g. will reply with nothing but an attachment which is an image of their typed non-proxied email address they want you to use. (I guess Amazon filters it or tells them off if it's typed in the body of the email.)