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Monthly Archives: February 2019

Gmail, machine learning, filters

I’m sure by now readers have seen the article from Gmail “Spam does not bring us joy — ridding Gmail of 100 million more spam messages with TensorFlow.” If you haven’t seen it, go read it. It’s not often companies write about their filtering philosophy and what tools they’re using to manage incoming bad mail. […]

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AOL FBL petering out

This is pretty clear evidence that AOL accounts are being transferred to the Oath / Verizon Media / Yahoo backend. AOL has been slowly disabling their postmaster pages and I don’t trust them to provide accurate info any longer. I am also way of using the contact forms at AOL these days. It’s possible that […]

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Deliverability Help: Information checklist

When asking a for assistance with email delivery, there are some pieces of information that are required before anyone can help. Be prepared with the information so you can get timely assistance. This advice is true whether you’re looking for help from peers or working with paid deliverability consultants. What is the problem? Be very […]

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Share your average bounce rates

The question came up on slack this morning about bounce rate benchmarks. What are the normal / average bounces that different ESPs see? Does region matter? What’s acceptable for bounce rates? Bounce rate is an overall measure of address quality Here’s your the chance for ESPs share the data from your customers. We’re interested in […]

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Cousin domains

When I checked in on Facebook this morning there was a discussion from a couple people frustrated by cousin domains. I share their frustration. Cousin domains are a major problem for ISPs trying to protect their users from phishing and other fraud. Because so many companies use cousin domains in their legitimate mail, ISPs can […]

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What SPF records should you publish?

When it comes to SPF records there seems to be a lot of confusion. I mean, a decade after I posted it Authenticating SPF is still the most frequently visited post on the site. And, of course, there are hundreds of other pages out there that discuss SPF and what to publish. Still, there are […]

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Undelivered mail without a bounce

A few weeks ago I wrote a blog post focusing on one small part of bounce handling. Today I want to talk about delivery failures that aren’t bounces. This is really the biggest issue for companies who have written their own bulk sending servers. Modern bulk MTA appliances and ESPs correctly handle these types of bounces. […]

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One subscription should equal one unsubscription

One of the side effects of using tagged addresses to sign up for things is seeing exactly what companies do with your data once they get it. For instance, 3 years ago I downloaded a white paper or something from an ESP. That white paper was apparently co-branded and the other company got my email […]

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