New dkim_key not saving to /etc/amavisd/60-dkim Include

I added a new email domain to my server yesterday. ISPconfig successfully created dkim files and DNS records. When I tested the email domain, I noticed the dkim signature wasn't getting attached to the email header.

I discovered the dkim_key for domain.com was missking from the /etc/amavisd/60-dkim file:

Code:

dkim_key('domain.com', 'default', '/var/lib/amavis/dkim/domain.com.private');

After manually adding this line and restarting dkim and postfix, the dkim signature appeared in the header as expected.
My 60-dkim file is owned by root with group amavis with 0750 permissions.

Is this a simple ownership or permissions problem?

I recently upgraded CentOS, PHP and roundcube mail, just want to be cautious.

 

Thanks Th0m, here are the current ownership and permissions:

Code:

]#ls -l /etc/amavisd | grep 60-dkim

-rwxr-x--- 1 root amavis  1011 Feb  8 17:23 60-dkim