* Luiz Antonio Emerenciano Alcoforado <l...@rapport.com.br>:
> I need to set up a group of four Postfix servers, all four in the
> same local network but each one connected to a different internet
> link, so that when one internet link fails, that Postfix server
> connected to the failing internet link forwards its pending emails to
> another Postfix server, one with a good internet access.

Use smtp_fallback_relay for that.

machine1 
smtp_fallback_relay = [machine2]

machine2
smtp_fallback_relay = [machine3]

machine3 
smtp_fallback_relay = [machine4]

machine4
smtp_fallback_relay = [machine1]

--
Ralf Hildebrandt
  Geschäftsbereich IT | Abteilung Netzwerk
  Charité - Universitätsmedizin Berlin
  Campus Benjamin Franklin
  Hindenburgdamm 30 | D-12203 Berlin
  Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962
  ralf.hildebra...@charite.de | http://www.charite.de
            

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