Wietse Venema wrote on 2/10/23 08:24:


There are two features that support sender-dependent routing:

sender_dependent_relayhost_maps

     This looks up a relayhost value that depends on sender.
     Like relayhost, this uses default_transport.
     It is seached with the envelope sender address and @domain.

sender_dependent_default_transport_maps

     This overrides transport and destination.
     It is seached with the envelope sender address and @domain.

In most cases, sender_dependent_relayhost_maps will do the job.

sender_dependent_default_transport_maps can be used to implement
quality of service for different senders.

Thank you very much. Those indeed sound like they're exactly what I need (as you say, probably sender_dependent_relayhost_maps is all I need). I'll have a shot at reconfiguring and testing my installation when I get a chance, sometime in the next few days.

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