On 2020-12-08 17:56 GMT, Chris Green wrote:

> So, is there something I can configure in postfix to always add some
> text of some sort (the hostname is the obvious thing) to one of From:,
> To: or Subject: ?

Try something like

   main.cf
      sender_canonical_maps = hash:/etc/postfix/sender-canonical-map

   sender-canonical-map
      root  foo-root

HTH,
-- 
Nick

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