'Delivered-To:' mail headers

Hi Guys

I've been running Postfix (2.0.16) on Debian Woody successfully for
sometime, how ever I keep getting 'Delivered-To' headers that don't seem to
be correct.

Typically, every incoming email I receive has 'Delivered-To:
gareth@mailgate.bim7.com' and sometimes also 'X-Original-To:
gareth@mailgate.bim7.com'.

This occurs no matter what address the sender uses...
gareth@virtualdomain1.com, gareth@vdomain2.com, gareth@virtdomain.net etc...

Shouldn't the 'Delivered-To:' contain the alias and domain relevant to where
the email was sent...?

If someone sends me an email to one of my virtual domains, I would expect to
see....

'Delivered-To: gareth@virtual-domain.com'.

In /etc/postfix/main.cf i have 'myhostname = mailgate.bim7.com', is this the
problem?

Any information much appreciated.


Gareth