From: Noel Jones (njonesmegan.vbhcs.org)
Date: Fri Dec 01 2006 - 13:24:48 CST

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At 09:52 AM 12/1/2006, Mirco Bakker wrote:
>Hi
>
>I try to configure a Postfix mail relay/firewall. So far
>everything works fine. The incoming and outgoing mails for
>my domain are relayd nicely. My problem is that the relay
>itself isn't able to send any mails.
>
>If I send a mail to a user on the internal mail server
>using sendmail, postfix doesn't lookup the transport map
>(I assume transport is bypassed). Instead it looks up the
>domains mx record and treis to send the mail to its proxy
>interface.
>
>Any Ideas? TIA, Mirco

Remove sendmail(TM) and use the sendmail program included
with postfix.

>- main.cf
>-------------------------------------------------------
>smtpd_banner = $myhostname ESMTP
>
>mydomain = localhost
>myorigin = host.example.com
>mydestination =
>local_recipient_maps =
>local_transport = error:local mail delivery is disabled
>
>transport_maps = hash:/etc/postfix/transport
>relay_domains = $transport_maps

Don't use $transport_maps as relay_domains. If you should
decide to add a special transport for some external site
you will become an open relay to that site. Safer:
transport_maps = hash:/etc/postfix/relay_transports
hash:/etc/postfix/transport
relay_domains = hash:/etc/postfix/relay_transports

>proxy_interfaces = mail.example.com

proxy_interfaces should be your external IP address, not a
hostname.

--
Noel Jones

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