Cory,

> I just read up on policy banks but all they talk about is the
> originating source.

That is the most common application, but mapping a port number
to a policy name is a general mechanism. It is up to a setup
and MTA configuration to attribute meaning to different
content filtering ports.

> The email may have originated from your internal 
> network but doesn't necessarily mean its going to be sent outside the
> network.  I see no variable or method of distinguishing an email thats
> destined for the outside world vs. one that is delivered locally.

If recipient matches @local_domains_maps it goes to an inside
recipient (inbound or all-internal), otherwise mail is outbound.

Note that policy banks are per-message, and @local_domains_maps is
per-recipient.  A message may have more than one recipient, which
means that inbound/outbound/internal distinction is not an
attribute of a message as a whole, but is applicable to recipients.
You need to combine a policy bank with @*_maps to distinguish
all three possibilities, if that is needed.

> The way mine is configured is as follows:
>
> email comes in to server:25 (postfix) > sends it to localhost:10024
> (amavis) > sends it to localhost:10025 (postfix)
>
> All mail travels the same path.  Its easy to alter a locally delivered
> email because you specify it in postfix's master.cf but there is nothing
> you can do for an email that isn't delivered locally from what I see.
> Am I missing something?

See some examples in:
  http://www.ijs.si/software/amavisd/amavisd-new-docs.html#pbanks-ex
and further down at #dkim.

Search RELEASE_NOTES (2.5.2) for:

- provided interface code to allow mangling/defanging/sanitation
  to be performed by an external utility, either by ...
[...]
- a special case of mangling is adding a disclaimer, by invoking an external
  program 'altermime' (if available and enabled). This differs from mangling
  inbound mail in two details:

and note example there.

  Mark


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