Messages destined for the popstore can be automatically forwarded
    to a different popstore addressee or to another address outside
    of the popstore altogether. This is done by establishing a
    forwarding address with the FORWARD command. For instance, to
    forward all mail for the popstore user SANDY to the address
    sandra@example.com, issue the command

    popstore> FORWARD SANDY SANDRA@EXAMPLE.COM

    The username supplied (e.g., SANDY) need not correspond to an
    actual popstore account.

    Note that if more than one forwarding address is supplied, then
    each address should be separated by commas and all the addresses
    enclosed in a set of double quotes. For example,

    popstore> FORWARD SANDY "SANDY,SANDRA@EXAMPLE.COM"

    When a forwarding address is established for an actual popstore
    user, that user will no longer receive mail in the popstore
    unless the forwarding includes their account in the list of
    addresses to forward to. For instance, the first example
    above would cause the account SANDY to no longer receive into
    the popstore mail sent to it. The mail is instead directed
    to sandra@example.com. In the second example, however, mail
    will still be stored into the popstore for the account
    SANDY. In addition, a copy of the mail will be forwarded to
    sandra@example.com.