SenderID and Domain Keys

One of my many duties in my current position at Quest is being in charge of email marketing globally. I have been doing some deliverabilty testing lately and noticed that our deliverability rates have been declining. Recently we have turned the corner on an issue with SPF and feel that our deliverabilty numbers should now trend upwards. However, I am curious to know if anyone out there is actively engaging with Domain Keys or Sender-ID. I understand how the technology works, but wonder if any of you have actually implemented anything to do with them.

As always, I am looking for ways to increase our effectivness of our email marketing efforts and any help would be greatly appreciated. Happy Friday to everyone…..