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Return Path Changes certification standards

Return Path recently announced changes to their certification program. They will no longer be certifying 3rd party mailers.

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Changes at Comcast

I can usually tell when one of the ISPs makes some change to their incoming spam filtering just by my call volume. The past few weeks the ISP in most of my calls has been Comcast. And, what do you know, they have made changes to how they are filtering email.
According to their bounce message, Comcast is using ReturnPath’s proprietary SenderScore product to filter mail. Reports on thresholds vary, but IPs with SenderScores of 70 and below have been blocked with messages similar to:

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Blocklists and standards

I received a comment this morning on my post about e360 v. Spamhaus, which I think brings up a point that deserves a post of it’s own. Skinny says:

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