Q about sender_dependent_relayhost_maps inbound vs outbound traffic

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Q about sender_dependent_relayhost_maps inbound...
\ Harakiri (8 May 2008)
. \ Victor Duchovni (8 May 2008)
. . \ Harakiri (8 May 2008)
. . \ Harakiri (8 May 2008)
. . . \ Victor Duchovni (8 May 2008)
. . . . \ Harakiri (8 May 2008)
. . . . \ Harakiri (8 May 2008)
. . . . . \ (Wietse Venema) (9 May 2008)
. . . . . \ Victor Duchovni (9 May 2008)
. . . . . . \ Harakiri (9 May 2008)
. . . . . . . \ (Wietse Venema) (9 May 2008)
. . . . . . . \ Victor Duchovni (9 May 2008)

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Subject:	Q about sender_dependent_relayhost_maps inbound vs outbound traffic
Group:	Postfix-users
From:	Harakiri
Date:	8 May 2008

Hi,

http://www.postfix.org/postconf.5.html#sender_dependent_relayhost_maps

states the order of the address lookup. Im not quiet sure if this setting works if you
use a postfix for inbound and outbound messages without using a 2nd postfix instance.

Lets say i have 2 internal e-mail domains which are managed on an e-mail server.

spam-check.com
no-spam-check.com

Both are routed over a postfix server, with sender_dependent_relayhost_maps i want that
spam-check.com domain is going over another anti-spam gateway which sents the message finally to
the internet using mx lookup and no-spam-check.com should be directly delievery from this postfix
using MX records. This should all work fine with the sender based routing.

Now lets see the inbound case, i.e. external.com is sending messages to my domains spam-check.com
and no-spam-check.com -

Based on the description for sender based routing "This information is overruled with
relay_transport, default_transport and with the transport(5) table." - for recipients of an
inbound message, the transport table will be used - so i could define a transport for
no-spam-check.com and spam-check.com to my internal mail server, in other words the sender based
routing table is ignored - no infinite loops should happend. Right ?

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