From: Wietse Venema (wietseporcupine.org)
Date: Tue Jul 21 2009 - 16:12:39 CDT

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Joris Dobbelsteen:
[ Charset ISO-8859-1 unsupported, converting... ]
> I'm using Postfix 2.3 (with debian etch, but I'm planning to go to
> postfix 2.5 with debian lenny). I'm using the postfix box solely for
> relaying e-mail and doing virus/spam scanning. Mail for local domains is
> relayed to a local server and everything else goes to my ISPs server. I
> currently use transport_maps to manage this and that is working fine for
> a couple years.
>
> Now I want to reduce the use of my ISP mail server. For IPv4 this is not
> possible: its troublesome with residential access & my ISP blocks
> outgoing port 25. However I have an IPv6 ip address where mail delivery
> is available.
>
> Is there any possibility to use the "transport_maps" to indicate
> multiple destinations?

No, but perhaps it is enough to set smtp_fallback_relay to the ISP.

smtp_fallback_relay = [mail.isp.example]

        Wietse

> I've seen reports that it didn't work for older versions. A few creative
> solutions where provided. Maybe someone else has a good idea?
>
> (To be honest, it has been over 2 years ago that I have looked very
> deeply in how Postfix moves mail messages around all classes and I have,
> not suprisingly, forgotten the details in the meanwhile, because the
> configuration simply worked and did not need modification).
>
> - Joris
>
>

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