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exim, variable string expansion

How can I get the list of local domains from a forward file?



An example of /etc/exim4/forwards:



a@test.com: a@lala.com
# ignore this line
b@test.com: a@example.com
b@hugo.com: hugo@example.com



Here the string expansion (or what ever it's called g) should return test.com : hugo.com.



I assume it can be done with readfile and map, but I can't get it to work.

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