We run outbound spam filtering servers for many domains.  We are 
constantly adding and deleting domains, and the current docs seem to 
imply the only way to sign all these domains is to specify each 
domain in the keylist file.

While this could be done, it would be a severely long file, and our 
purpose is to sign ALL outgoing messages for every domain using the same key.

Ideally something like this in the keyfile:
*:*:/etc/mail/dkim/keys/default

The result would be if the sender's IP matches an IP within the 
trusted-hosts file, it signs the message using the default key no 
matter what from the sender domain.  We can publish the public key in 
DNS for each domain as well.

Second best would be to sign all outgoing messages with the same key, 
on a single signing domain, like this:
*:genericdomain.com:/etc/mail/dkim/keys/default

Note, this configuration works, but it signs messages from any domain 
with the genericdomain.com key.  This method seems to somewhat defeat 
the purpose of DKIM because I think the recipient's server would 
ideally like the key signed from the domain in the FROM address for 
maximum reliability.

Any thoughts on how to best accomplish this?

- Nate


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