From: Amin (raihancitech-bd.com)
Date: Tue May 27 2003 - 04:58:54 CDT

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In message <oprptmy8kkpjqb8nlocalhost>, Ralph Piller writes:
> PC.office-domain who is accessible from the Internet. So we tried to
> tell Postfix to change the Sender of outgoing E-Mail to
> usernameISP-domain as if we are sending via the ISP's Mail-Server
> (btw. office- domain and ISP-domain are different)

You need to implement masquerading --- by putting the following lines
into your main.cf file:

masquerade_classes = envelope_sender, header_sender, header_recipient
masquerade_domains = isp.domain
sender_canonical_maps = hash:/etc/postfix/sender_canonical

Note that you should have the ``sender_canonical'' file in the
/etc/postfix directory containing mappings of addresses, like this:

usernameoffice-pc.office-domain usernameisp.domain

and run ``postmap sender_canonical'' to generate a
``sender_canonical.db'' file that Postfix can use to do the address
mapping.

The best place (IMHO) to read up on address masquerading is Red Hat's
Postfix HOWTO at:

www.redhat.com/support/resources/howto/RH-postfix-HOWTO/book1.html

Good luck.
Yawar Amin

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