Thoughts on Microsofts CallerID [1,2] has some good articles on anti-spam technologies and points out, that CallerID works in a very similar way to SPF, RMX and other protocols to verify the sending host. Microsoft introduced its CallerID at as you can test yourself:

# host -t txt

So from the technical side it seems that the CallerID(ea) is probably even behind what SPF is capabale of [3,4,5]. On the other hand, some argue, that Microsoft might to \”acknowledge Open Source without accepting some of the risks of being truly Open Source might bring\”:

This product may incorporate intellectual property owned by Microsoft Corporation. If you would like a license from Microsoft, you need to contact Microsoft directly [3].

From that perspective, the patent claims by Microsoft might be only defensive [4]. Some searching for latest patents by Microsoft (Title or Abstract: spam, Applicant: Microsoft) only reveals four related patents, one of them published in January 2004 [6].

If – on a legislatory level – Microsoft intends to push its technology, one should point out to the governmental experts and commissions that there are already technical alternatives that should be taken in account as well.


Leave a Reply