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Email forwarding generically refers to the operation of re-sending an email message delivered to one email address to one or more different email addresses.
Email forwarding can also redirect mail going to a certain address and send it to one or more other addresses. Vice versa, email items going to several different addresses can converge via forwarding to end up in a single address in-box.
Definition copied from https://en.wikipedia.org/wiki/Email_forwarding