As predicted, Microsoft’s efforts to license the new SenderID anti-SPAM technology is causing all sorts of problems with the Open Source community. Microsoft want their alleged intellectual property to be made part of the new industry standard on mail authentication. The problem is that their “license” is not compatible with the GPL and other Open Source licenses. What that means is that some of the biggest MTA ‘s (mail server applications) in use on the Internet may not be able to use the new technology. I suspect Microsoft hopes that will encourage people to buy their own mail server software, or perhaps they consider it a potential lever to use against OSS (Open Source Software) sometime in the future.
Sendmail, Postfix, Courier and other Open Source MTA’s have licenses that basically make anyone using the software a “sub licensee”, something that may well be incompatible with Microsoft’s IP license. As it stands right now, Sendmail have created a testing milter plug-in for SenderID, but did so without any license with Microsoft.
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