forwarding

New to Postfix. Not sure how to accomplish this.

Right now I've got MS-SMTP behind NAT. Ports 25 and 587 forwarded.

I would like to forward 25 to Postfix, so Postfix can perform filtering, and
then Postfix can forward mail to MS-SMTP. Users could still auth-relay with
MS-SMTP on port 587.

I'm not worried about filtering at this point. I'd just like to get
forwarding going. I need to forward e-mail for three domains from Postfix to
MS-SMTP and disable all other traffic on Postfix. I've read doc after doc
and I'm still not sure how to make this happen. Will continue researching...
Help much appreciated.

Allow me to simplify my example:

I've got two Postfix (pf1 and pf2) open relays and an MS-SMTP (ms).

DNS:
pf1.domain.com a 192.168.0.7
pf2.domain.com a 192.168.0.8
ms.domain.com a 192.168.0.2
domain.com mx pf2.domain.com

MUA sends mail for anybox@domain.com to pf1.domain.com (designated SMTP).
pf1.domain.com sends mail for anybox@domain.com to pf2.domain.com
(designated MX).

How do I get pf2.domain.com to forward mail for anybox@domain.com to
ms.domain.com.

"D" <d@invalid> wrote in news:4299202e$0$85758$892e7fe2
@authen.white.readfreenews.net:

> How do I get pf2.domain.com to forward mail for anybox@domain.com to
> ms.domain.com.

something like:

main.cf:
relay_domains = domain.com
transport_maps = hash:/etc/postfix/transport

/etc/postfix/transport:
domain.com smtp:[192.168.0.2]

If you do something like this, you will probably want to setup
relay_recipient_maps so that invalid mail is rejected upfront instead of
passed on and bounced later.

Thanks.

I wonder, is it possible to use a wildcard in the virtual alias map?
Something like:

postmaster@* postmaster@domain.com