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Following the SMTP rules

An old blog post from 2013, that’s still relevant today. “Blocked for Bot-like Behavior” An ESP asked about this error message from Hotmail and what to do about it. “Bot-like” behaviour usually means the sending server is doing something that bots also do. It’s not always that they’re spamming, often it’s a technical issue. But the technical problems make the sending server look like a bot...

Whirlwind that is M3AAWG

It’s been a great conference, and it’s only about half done. As is common at these conferences, I write down lots of things we should do and need to publish. The difference is now that we are growing I may have the time to put the polish on them and get them published. Today’s keynote discussed the economics of botnet mitigation. Michel van Eeten from Delft University of...

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