Updating SenderID records for Microsoft

In the past, bulk senders who wanted Microsoft to check SenderID had to email information to a special Microsoft address. Microsoft would then cache the senderID data from the sender’s DNS records and verify incoming email.
Microsoft has simplified the process and now has a webform to submit the data.
http://support.msn.com/…
In order to submit your information you will need a contact email address, the domains that you want to add and the SPF records of those domains.