I have DKIM set up for one domain and it works properly. I am trying, though, to set it up for another domain name on the same machine. In short, I am sending registration and password recovery emails from one domain and everything else from the other domain. Both domains map to the same host.

Setting up domainkeys in this manner was no problem - adding another "DAEMON_OPTS=" line in /etc/default/dk-filter was the solution. This is not the case for DKIM, though, since it stores this information in a configuration file (/etc/dkim-filter.conf) that is formatted in a completely different manner.

Any help would be most appreciated. Thanks.