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Category: Delivery Improvement

The source of deliverability problems

Most deliverability problems don’t start where many people think they do. So very often people call looking for deliverability help and tell me all about the things they’re doing to reach the inbox. They’ll tell me about content, they’ll tell me about bounces, they’ll talk about complaints, engagement, opens and clicks. Rarely will they bring […]

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Dueling data

One of the things I miss about being in science is the regular discussions (sometimes heated) about data and experimental results. To be fair, I get some of that when talking about email stuff with Steve. We each have some strong view points and aren’t afraid to share them with each other and with other […]

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The 10 worst …

Spamhaus gave a bunch of us a preview of their new “Top 10 worst” (or should that be bottom 10?) lists at M3AAWG. These lists have now been released to the public. The categories they’re measuring are: Countries Spam ISPs Spammers Botnet Countries Botnet ISPs Botnet ASNs TLDs Nothing really surprising there, but it’s nice […]

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Ask Laura

An Advice Column on Email Delivery When we work with brands and senders to improve email delivery, there are many questions that come up again and again. For 2016, we thought it might be interesting to answer some of those questions here on the blog so others can benefit from the information. Confused about delivery […]

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Troubleshooting delivery is hard, but doable

Even for those of us who’ve been around for a while, and who have a lot of experience troubleshooting delivery problems things are getting harder. It used to be we could identify some thing about an email and if that thing was removed then the email would get to the inbox. Often this was a domain […]

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CASL botnet take down

The CRTC served its first ever warrant as part of an international botnet takedown. The warrant was to take down a C&C (command and control) server for Win32/Dorkbot. International efforts to take down C&C servers take a lot of effort and work and coordination. I’ve only ever heard stories from folks involved but the scale […]

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Tell me about your business model

I posted Friday about how most deliverability folks roll their eyes when a sender starts talking about their business model. The irony is that one of the first things I do with a client is ask them to tell me about their business model and how email fits into their business plan. Once I know […]

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SPF debugging

Someone mentioned on a mailing list that mail “from” intuit.com was being filed in the gmail spam folder, with the warning “Our systems couldn’t verify that this message was really sent by intuit.com“. That warning means that Gmail thinks it may be phishing mail. Given they’re a well-known financial services organization, I’m sure there is a lot […]

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Deliverability at Yahoo

We have multiple measures of deliverability. Ones that we don’t even let in the door, and then we have ones that customers indicated that they don’t want to be delivered.  – Jeff Bonforte, Senior VP Communications, Yahoo Mail Read a little more about Yahoo and spam over at Tech Insider, or listen to the podcast at […]

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IPv6 and authentication

I just saw a post over on the mailop mailing list where someone had been bitten by some of the IPv6 email issues I discussed a couple of months ago. They have dual-stack smarthosts – meaning that their smarthosts have both IPv4 and IPv6 addresses, and will choose one or the other to send mail over. […]

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  • HE.net DNS problems

    Hurricane Electric had a significant outage of their authoritative DNS servers this morning, causing them to return valid responses with no results for all(?) queries. This will have caused delivery problems for any mail going to domains using HE.net DNS - which will include some of their colocation customers, as well as users of their free services - but also will have caused reverse DNS to fail for most servers hosted by Hurricane Electric worldwide, so if any of your mail is being sent from HE hosted machines you may have seen problems. (We're HE customers so we noticed. Still happy with them as a vendor.)No Comments


  • 65.0.0.0/8 DNS issues

    If you're sending email from any address beginning with a 65 - in 65.0.0.0/8 - it's possible you'll see some delivery problems. Something appears to be broken with dnssec signatures for the reverse DNS zone, leading queries for reverse DNS to fail for anyone using a dnssec aware DNS resolver (which is almost everyone).1 Comment


  • Our green bar certificate is going away

    Later today we'll be switching from an Extended Validation ("green bar") SSL certificate to a Domain Validation certificate. This isn't exactly a planned change but I'm waiting for responses from Comodo before I go into it too much. I'll share some more details next week.3 Comments


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