When my email server receives mail sent to an unknown local user should the server send the message back to the sender or should the email just be dropped?
I'm just curious what is most preferred. I can think of cases where both options are helpful and unhelpful. For example, spam that is sent to an unknown local address probably should not be bounced back to the sender because it will most likely be sent back to another unknown address. But in some cases someone could have just made a typo on a legitimate email. Thanks.