[Exim] Force new (valid) Exim-style message id from system f…

Hi there,

can you please comment on the following approach to "overwrite" locally (i.e. by
machines in my LAN) generated (and possibly faulty) message ids by Exim-
generated (valid) ones?

  if ${mask:$sender_host_address/24} is "192.168.2.0/24" then
    headers remove Message-ID
    headers add "Message-ID: $message_id@$primary_hostname"
  endif

Is this a clever approach? Or am I overseeing something?

Thanks,

Ralf

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