more Anti-spam countermeasuresYahoo! implements DomainKeys Authentication. http://www.eweek.com/article2/0,1759,1727074,00.asp It seems somewhat similar to SPF, though more secure in that it has to verify an encrypted signature attached to each message. http://antispam.yahoo.com/domainkeys The downside is that it seems slightly more difficult to implement for virtual hosting environments. I don't think any of this affects ringmasters right now, but it is good to know what is coming down the pike.
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