Tag: filters

When did the reject happen?

Earlier today I approved a comment from Mike on a post about problems at AOL from 2012. The part of the comment that caught my attention: SMTP error from remote mail server after end of data: 521 5.2.1 : AOL will not accept delivery of this message. Mike also mentioned his IP reputation is good, […]


DOD breaks links in .mil clients

The Department of Defense is breaking HTML links in mail to .mil domains. This is part of the DoD’s attempt to curtail phishing. a great majority of intrusions into Pentagon networks are the result of the kind of human error that is exploited in phishing attacks, in which seemingly trustworthy e-mail links are used as attack […]


Filter complexity

During the Q&A last week, I mentioned an example of a type of filter trying to demonstrate how complex the filters are. There was some confusion about what I was saying, so I thought I’d write a blog post explaining this. Background This story came from another deliverability person, let’s call her ESPer. One of […]

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Thanks for the great session

I had a great time answering questions at the 2015 All About eMail Virtual Conference & Expo today. Thanks so much to everyone who participated and asked questions. They were great and I’m sorry we didn’t have more time. I did get some questions on twitter (@wise_laura) afterwards. One was about an example I gave to […]

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Do system administrators have too much power?

Yesterday, Laura brought a thread from last week to my attention, and the old-school ISP admin and mail geek in me felt the need to jump up and say something in response to Paul’s comment. My text here is all my own, and is based upon personal experience as well as those of my friends. That […]


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 […]


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 […]


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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  • Lost in the mists of time

    Over on the Farsight Security blog Joe St. Sauver talks about some of the early days of online abuse, on usenet. Laura and I were on the periphery of early usenet abuse, mostly as users, but Usenet (and IRC) around then were the places we both started with email abuse.No Comments

  • 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