In documentation that Microsoft is going to release shortly, they have some recommendations on how to set up your SenderID records as well as a list of frequently asked questions. I will post a link to the relevant documents when they become available. For now, here's a sneak peek at some of the comments and recommendations (I have made a few modifications for grammar and added a couple of extra commentaries):
The last two questions, I think, are especially relevant to the SPF vs SenderID debate. The guys at OpenSPF say that there will be a big problem if you use SenderID, whereas Microsoft says in most cases there won't be. However, Microsoft does acknowledge that sending domains need to be careful if they use different domains in the envelope sender from the one that shows up in the From: address. In other words, it works most of the time by default but there are special cases that need to be handled.
This is just like anything in life - there are always exceptions to the rule.
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"This is just like anything in life - there are always exceptions to the rule." Yep, e.g., +all is not necessarily nonsense if used within an -include:not.me.example policy to accelerate FAIL.
If a confused spammer intentionally wants to permit "all IPs", missing several clues in SPF and SenderID, then there are many ways to get that effect, not only an obvious +all.
More practical, just using spf2.0/pra if folks want PRA, and using v=spf1 if they want SPF, is no rocket science. Mail admins know that checking PRA policies against SPF (HELO or MAIL FROM), or vice versa, is by definition a bad idea.
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