No one seems to have really addressed if and how DomainKeys can be added to a Zimbra server. I would like to be ahead of the curve on this for 2 reasons:
1) According to what I've read Yahoo! is putting more and more emphasis on this technology (probably due to their vested interest in it). As such it's conceivable a proper reverse DNS will not forever shield us from the junk mail folder.
2) Yahoo! already introduces a delay on e-mails when it receives a bunch from a single source in a short time. Supposedly utilizing DomainKeys prevents the e-mails from being intentionally delayed.
Is this way off base? If not, does anyone have some pointers (read: semi-detailed instructions or links to similar ) on getting DomainKeys installed in the Zimbra e-mail system?
To hedge my bets I wouldn't mind implementing Sender ID as well, though despite having an MS background I know even less about it compared to DomainKeys