ALL_TRUSTED should fire if msg is only transported via trusted hosts, so
you can do && !ALL_TRUSTED
But would it not be better to not accept such messages in first place
and reject them on your border mta?

Am 27.11.2017 um 13:57 schrieb Ralf Hildebrandt:
> How can I distinguish my internal networks from the evil internet in a
> spamassassin rule?
> 
> I want to give messages coming from "not mynetworks" but using my
> domain in the From: header some additional points:
> 
> header      MY_FROM   From =~ /charite.de/i
> describe    MY_FROM   Sender is from charite.de
> 
> # Now you create a rule to combine them:
> meta     MY_FROM_FROM_OUTSIDE  MY_FROM && HOW_DO_I_QUERY_TRUSTED_NETWORKS
> describe MY_FROM_FROM_OUTSIDE  Sender is from my domain, but comes from the 
> outside
> score    MY_FROM_FROM_OUTSIDE  1.0
> 
> 

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