This particular is useful with InternalHosts that needs to be kept consistent with postfix's mynetworks settings. All postfix's database types can do this so it would be good for opendkim to lookup the same database.
Postfix uses various map types and some are similar to what opendkim already does.
http://www.postfix.org/DATABASE_README.html note the very last sentence.
In debian/ubuntu this is:
tcp /usr/lib/postfix/dict_tcp.so dict_tcp_open
So a dl load of the required interfaces is required. I haven't looked what ABI is needed.
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