OnlyMy Email (www.onlymyemail.com) released some new research on the effectiveness of Sender ID as an anti-spam solution. The research found that emails sent by a domain without a published SPF record are actually slightly less likely to be spam than those sent by domains that publish Sender ID information in their DNS record. The study inferred that 1 out of 6 emails that “pass” Sender ID verification will actually be spam. The research goes on to note that spammers are publishing the SPF records for their “throw-away” domains to increase spam delivery.
Research Determines Sender ID Ineffective Against Spam, Fixing Email Weblog
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