Syslog yes
SyslogSuccess yes
Canonicalization relaxed/simple
OversignHeaders From
UserID opendkim
UMask 007
Socket inet:8891@localhost
PidFile /run/opendkim/opendkim.pid
TrustAnchorFile /usr/share/dns/root.key
Mode sv
Canonicalization relaxed/simple
KeyTable refile:/etc/opendkim/KeyTable
SigningTable refile:/etc/opendkim/SigningTable
ExternalIgnoreList refile:/etc/opendkim/TrustedHosts
InternalHosts refile:/etc/opendkim/TrustedHosts
Make the file look like this then restart opendkim systemctl restart opendkim
also restart postfix, then check.