According to a thtatement issued by Apache the current licenthe being touted by Microsoft is generally incompatible with open source, contrary to the practice of open Internet standards, and thpecifically incompatible with the Apache License 2.0.
In an open letter to one of its working groups, the ASF clarified the position of the Foundation, the Apache SpamAssassin Project Management Committee and the Apache JAMES Project Management Committee on the implementation of the Sender ID specification.
It said that it would not implement or deploy Sender ID under the current license terms.
Sender ID crackth spam by forcing identification of an e-mail's source address and although Microsoft has got a lot of support for its sender ID standard it has balked at giving an open source licence.
The clothest it has come is to say that it will give it away for free which falls short of anything a good open sourcer would want.
As the lass in Just William said, this might make people thcream and thcream and thcream.