Misunderstanding of transport map format VS master.cf

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Misunderstanding of transport map format VS mas...
\ Jeremie Le Hen (14 Jun 2007)
. \ Ralf Hildebrandt (14 Jun 2007)
. \ mouss (14 Jun 2007)

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Subject:	Misunderstanding of transport map format VS master.cf
Group:	Postfix-users
From:	Jeremie Le Hen
Date:	14 Jun 2007

Hi,

I'm reading the chapter 11 "How External Content Filters Work" of
Ralf Hildebrandt and Patrick Koetter's Postfix book.

In main.cf, the book tells to use ``content_filter'' like this:
% content_filter = foo:[127.0.0.1]:54321

Later on the "foo" transport is defined in master.cf:
% foo unix - - n - 2 smtp
^^^^
% -o smtp_data_done_timeout=1200s
% -o disable_dns_lookups=yes
% ...

As far as I understand master(5) manual page, the service "foo" is
defined to listen on a UNIX socket but main.cf gives an inet address.

What am I missing here?

Best regards,
--
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >