[exim] how to use dnslookup for deliverying local mail witho…

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Autor: krzf83@gmail.com
Datum:  
To: exim-users
Betreff: [exim] how to use dnslookup for deliverying local mail without infinite loop?
Let's assume that I don't have control over the contents of
local_domains list. Someone could put there a domain that is not
handled by my server according to dns records. Now every email sent
from my server to that domain is delivered to my server instead of
remote smtp.
How can I tell exim to use/check/veryfy dnslookup for delivering mail
from local domains to local domains and still avoid infinite loop when
delivering mail?