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On Mon, Jan 25, 2010 at 1:49 PM, Simon Waters wrote: > I very much doubt the 53% of server use SPF, possible 53% of senders set it > on a domain. Very few who deploy SPF filters reject out right on failure, > which tells you how useful it is at it's own job. Here's an EU survey that suggests just short of 40% of ISPs use SPF to authenticate the sender, while less than 20% use DKIM: http://www.enisa.europa.eu/act/res/other-areas/anti-spam-measures/studies/spam-survey/at_download/fullReport It's interesting, as I think DKIM is much more powerful, but perhaps it's because SPF is easier to use. Martijn. -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html