On Sun, Nov 23, 2008 at 03:06:27AM -0600, Ville Walveranta wrote:
> The problem here is that the local server is also
> the final destination for the primary domain. When I do a redirect in
> virtual_alias_maps:
>
> [EMAIL PROTECTED] [EMAIL PROTECTED]
>
> ..the mail gets delivered locally because the primarydomain.com is in
> virtual_mailbox_domains/virtual_mailbox_maps. I would like the mail to
> be delivered instead to the external filtering service's MX, where it
> would be filtered and, if clean, would eventually be delivered at the
> [EMAIL PROTECTED] at the local server.
>
> Perhaps some transport map could resolve this? The problem is that I can't
> use..
>
> [EMAIL PROTECTED] smtp:mx.externalspamfilteringservice.com
>
> ..because that would result in a loop. Somehow I'd need to combine the
> entry in virtual_alias_maps and the transport map instruction to
> deliver the remapped email at the external SMTP server.
>
> Can this be done?
Yes, you need to use a combination of "virtual" and ""generic" rewriting,
together with a transport override:
virtual:
[EMAIL PROTECTED] [EMAIL PROTECTED]
transport:
efilter.invalid smtp:example.net
generic:
@efilter.invalid @example.com
main.cf:
virtual_alias_maps = hash:/etc/postfix/virtual
transport_maps = hash:/etc/postfix/transport
smtp_generic_maps = hash:/etc/postfix/generic
# This domain is delivered here, perhaps via some other mechanism
mydestination = example.com
This will deliver mail for [EMAIL PROTECTED] to [EMAIL PROTECTED] via an
external filter service whose MX records are listed at example.net.
The envelope recipient seen by exmaple.net will be [EMAIL PROTECTED],
but your logs will record a delivery to [EMAIL PROTECTED]
Adjust the domain names to taste, make sure the intermediate domain
used to route traffic to the external provider is never going to
be a valid DNS domain (the ".invalid" namespace is RFC reserved).
--
Viktor.
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