@lbutlr:
> > Then, expand the virtual alias before the filter.
> 
> Not to be thick, but how would I control the order?

With an after-queue content filter, to prevent the before-filter
Postfix SMTP server from rejecting virtual_alias_maps or canonical_maps
addresses as "user unknown": 

- Don't specify "receive_override_options = no_address_mappings"
  in main.cf.

- Don't specify "receive_override_options = no_address_mappings" with
  the pickup daemon.

- Don't specify "receive_override_options = no_address_mappings" with
  any before-filter Postfix SMTP server.

- Don't specify "receive_override_options = no_address_mappings"
  with the smtp port (port 25).

- Don't specify "receive_override_options = no_address_mappings"
  with the submission port (port 587).

- Don't specify "receive_override_options = no_address_mappings"
  with the smtps port (port 465).

        Wietse

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