email@domain.com to two pop accounts?

We have a user that wants to have sales@domain.com going to two different email box's.
However, he does not really want to setup a mailinglist since hes not very technical minded..

Is there a &simple& way to get sales@ to the two different email box's?

When setting up forwarding (twice) he gets the error:
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

ste@server.name.net
(ultimately generated from sales@domain.co.uk)
unknown local-part &ste& in domain &server.name.net&


He does get the email however, just he also recives an error by email too.

Craig.