exim4 DKIM lookup from file DB

30_exim4-config_remote_smtp

### transport/30_exim4-config_remote_smtp
#################################
# This transport is used for delivering messages over SMTP connections.

DKIM_DB_FILE = /etc/exim4/dkim_lookup.db

DKIM_DOMAIN = ${lc:${domain:$h_from:}}
DKIM_FILE = /etc/exim4/dkim/${lookup{DKIM_DOMAIN_key}lsearch{DKIM_DB_FILE}}
DKIM_PRIVATE_KEY = ${if exists{DKIM_FILE}{DKIM_FILE}{0}}
DKIM_SELECTOR = ${lookup{DKIM_DOMAIN_selector}lsearch{DKIM_DB_FILE}}
### DKIM_SELECTOR = ${if exists{DKIM_SELECTOR_FILE}{${readfile{DKIM_SELECTOR_FILE}{}}}{mail}}

dkim_lookup.db

xn--90acimkexb.xn--p1ai_key: belikovo.rf.key
xn--90acimkexb.xn--p1ai_selector: default

karcher-online.ru_key: karcher-online.ru.key
karcher-online.ru_selector: default

mylocal.ru_key: mylocal.ru.key
mylocal.ru_selector: mail

gen_key.sh

cd /etc/exim4/dkim
dkim-genkey -d belikovo.ru -r
mv default.private belikovo.ru.key
cat default.txt
chmod 0755 belikovo.ru.key