Sender Authentication: What Is It, and How Can It Help You?

IF: What is a reasonable timetable to implement a sender authentication program?
Guerra: Senders should ensure they are using SPF now, especially if they send to AOL recipients. The other protocols haven’t yet gained wide acceptance and don’t yet significantly affect deliverability. Senders should keep an eye on developments and be prepared to implement them as they become more accepted. Those senders who wish to take extra precatuions and want to gain experience with the technologies before they become widely used should implement Sender ID after SPF, then possibly implement Yahoo!’s DomainKeys.