DKIM only on the host, not individual domains.

Hi all,



Does anyone know if it could make sense to only install DKIM on the hostname of the outgoing mailserver?

Since my mail is sent using:



Return-path: <user@vps1.myhostname.com>

Received: from user by vps1.myhostname.com with local (Exim 4.84)

(envelope-from <user @vps1.myhostname.com>)

id 1YekF9-0007kz-KO; Sun, 05 Apr 2015 15:05:39 +0200



( note the "user" and "myhostname.com" are spoofed for example purposes. )



The reason I ask is that I do not wish to copy/paste over 300 keys from DirectAdmin to my external nameservers.

But I wish all the domains hosted by my server to pass DKIM as much as possible.



If signing the outgoing vps1.myhostname.com (which is used for all e-mail domains in the From header) is enough.

That would be greatly preferable :)



Thanks for any of your insights.



Regards!

Armand

DKIM only on the host, not individual domains.