I made DKIM configuration as mentioned in ZCS manual by running:
/opt/zimbra/libexec/zmdkimkeyutil -a -d rush.zone
Tested it:
/opt/zimbra/opendkim/sbin/opendkim-testkey -d rush.zone -s {Domain Selector} -x /opt/zimbra/conf/opendkim.conf
No errors till now. Restarted ZCS. And still no DKIM signature header in messages nor from mail sent via Webmail, neither from SMTP.
Let me know where should I look in to debug this issue.
Thanks!
Add 127.0.0.1 at the end of /opt/zimbra/conf/opendkim-localnets.conf.in and do:
$ su - zimbra
$ zmcontrol restart