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Tag: filters

Politics and Delivery

Last week I posted some deliverability advice for the DNC based on their acquisition of President Obama’s 2012 campaign database. Paul asked a question on that post that I think is worth some attention. I am fascinated by the ramifications of email deliverability for political donations. Are there sysadmins at the big ISPs who make […]

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Pattern matching primates

Why do we see faces where there are none? Paradolia Why do we look at random noise and see patterns? Patternicity Why do we think we have discovered what’s causing filtering if we change one thing and email gets through? It’s all because we’re pattern matching primates, or as Michael Shermer puts it “people believe […]

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4 things spammers do legitimate marketers don’t

I’ve never met a spammer that claims to be a spammer. Most that I’ve met claim to be legitimate marketers (or high volume email deployers). But there are things spammers do that I never expect to see a legitimate marketer doing. I’ve written about these things throughout the blog (tag: TWSD), but it’s probably time […]

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What to do when an important email bounces

Some emails are more important than others. I know, I know, all emails are important, but really, some are more important than others. I’ve recently been decluttering by the simple expedient of enrolling in paperless statements for some of our accounts. We have a 1TB NAS, I’m not going to run out of storage space […]

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Thoughts on Gmail filtering

Gmail has some extremely complex filters. They’re machine learning based and measure hundreds of things about incoming mail. The filters are continually adjusting to changes and updating how they treat specific mail. One consequence of continually adjusting machine learning filters is that filtering is not static. What passes to the inbox now, may not pass […]

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When spam filters fail

Spam filters aren’t perfect. They sometimes catch mail they shouldn’t, although it happens less than some people think. They sometimes fail to catch mail they should. One of the reason filters fail to catch mail they should is because some spammers invest a lot of time and energy in figuring out how to get past […]

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Language as filtering criteria

A few months ago I was working on a delivery audit for a client who sends mail in multiple languages. We discovered that the language of an email has a significant delivery impact. The same email in different languages was delivered differently, particularly at Gmail. Emails in a language I don’t normally receive email in were […]

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AHBL Wildcards the Internet

AHBL (Abusive Host Blocking List) is a DNSBL (Domain Name Service Blacklist) that has been available since 2003 and is used by administrators to crowd-source spam sources, open proxies, and open relays.  By collecting the data into a single list, an email system can check this blacklist to determine if a message should be accepted […]

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Email problems are costly

Last week Zulily released their quarterly earnings. Their earnings’ report was disappointing, resulting in a drop in their stock prices. The chairman of the company told reporters on a conference call that part of the reason for the drop in earnings were due to deliverability problems “at a large ISP.” Zulily ran into problems with a […]

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ISP filters are good for marketers

A throwback post from 2010 Attention is a limited resource. Marketing is all about grabbing attention. You can’t run a successful marketing program without first grabbing attention. But attention is a limited resource. There are only so many things a person can remember, focus on or interact with at any one time. In many marketing […]

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  • Ongoing Yahoo delays

    I've been hearing from folks over the last few days that they're seeing an uptick in deferrals from Yahoo! The deferrals are not uniform. ESPs report they're seeing some, but not all, customers affected. Other ESPs aren't seeing any changes. It's not just you. But it would be very worthwhile to dig into engagement and other stats. It's possible this is a new normal at Yahoo! and they're tightening filters to catch mail that doesn't fit their standards but was previously difficult to filter.No Comments


  • AOL starts using Sender Score Certification

    Good news for Sender Score Certified IPs. Return Path recently announced that AOL has joined the list of ISPs offering preferential treatment to certified IPs.  1 Comment


  • iCloud Service Disruption

    40% of iCloud users were affected this morning during a service disruption between 2:15AM and 9:30AM. Apple System StatusNo Comments


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