Spam Resource: Fun with data: DMARC at top 100 MBP domains

Al Iverson just published a new engaging article on Spam Resource:

I’ve got just a tiny slice of data for you today. I took the top 100 (US) mailbox provider domains, as measured by mail sent to them, and looked for DMARC records. Do they have a DMARC record? And if so, what is the DMARC policy? Things look good from this angle. Seventy of those top 100 domains do indeed have some sort of DMARC policy in place. Of those that have a DMARC policy in place, just over 60% of those domains have a restrictive (p=quarantine or p=reject policy). This is particularly timely given that Gmail’s upcoming requirements say you should not impersonate (send as) gmail.com in your from address. Based on how internet service providers (ISPs) and mailbox providers (MBPs) are moving to respect DMARC policy, that restriction also applies to a good two-thirds of the top MBP domains. Remember: Your from address should only contain a domain

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