OpenDKIM.conf

/etc/opendkim.conf:
AutoRestart             Yes
AutoRestartRate         10/1h
UMask                   002
Syslog                  yes
SyslogSuccess           Yes
LogWhy                  Yes

Canonicalization        relaxed/simple

ExternalIgnoreList      refile:/etc/opendkim/TrustedHosts
InternalHosts           refile:/etc/opendkim/TrustedHosts
KeyTable                refile:/etc/opendkim/KeyTable
SigningTable            refile:/etc/opendkim/SigningTable

Mode                    sv
PidFile                 /var/run/opendkim/opendkim.pid
SignatureAlgorithm      rsa-sha256

UserID                  opendkim:opendkim

Socket                  inet:12301@localhost

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/etc/opendkim/KeyTable:
mail._domainkey.example.pw example.pw:mail:/etc/opendkim/keys/example.pw/mail.private
mail._domainkey.example2.hu example2.hu:mail:/etc/opendkim/keys/example2.hu/mail.private

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/etc/opendkim/SigningTable:
*@example.pw mail._domainkey.example.pw
*@example2.hu mail._domainkey.example2.hu

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/etc/opendkim/TrustedHosts:
127.0.0.1
localhost
192.168.0.1/24

*.example.pw
*.example2.hu