/etc/dkimproxy/dkimproxy_out.conf is in dkimproxy 1.4.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | # specify what address/port DKIMproxy should listen on
listen 127.0.0.1:10028
# specify what address/port DKIMproxy forwards mail to
relay 127.0.0.1:10029
# specify what domains DKIMproxy can sign for (comma-separated, no spaces)
domain example.org
# specify what signatures to add
signature dkim(c=relaxed)
signature domainkeys(c=nofws)
# specify location of the private key
#keyfile /full/path/to/private.key
# specify the selector (i.e. the name of the key record put in DNS)
selector postfix
# control how many processes DKIMproxy uses
# - more information on these options (and others) can be found by
# running `perldoc Net::Server::PreFork'.
#min_servers 5
#min_spare_servers 2
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