Had to setup 54 DKIM certificates on the server + DNS configuration. It's a long process. Would be great when we setup a new domain, iRedAdmin-Pro would do the following :
1 - Generate a new DKIM key in /var/lib/dkim
2 - Add the domain in Amavis config file (@local_domains_maps)
3 - Add the key in Amavis config file (dkim_key("domain.com", "dkim", "/var/lib/dkim/domain.com.pem");
4 - Output the DKIM key under the domain settings -> Advanced (So we can copy/paste the key for the DNS part)
5 - Enabling/Disabling DKIM for the domain. (Optional)
Cheers!