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Forwarding a users mail to another address is handled by a simple entry in the aliases file. For example, if you wanted to forward mail for john to henry...do this.

vi /etc/aliases ( for some common VI commands see here.....)

scroll to the end of the file and your syntax will be as follows:

john:        henry

Save the file and run the command newaliases.
This tells sendmail to re-read the changes.

If you were sending mail to an external email address, the syntax would be:

john:        henry@hotmail.com

If you were sending mail to multiple addresses, the syntax would be:

john:        henry@hotmail.com , sam@hotmail.com , george@hotmail.com

Very simple.