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Tag: data verification

Trust the list broker

Over the years I’ve worked with companies who admit to me that they’ve purchased data at one point or another. Let’s face it, as bad a practice as it is, people and companies still think they can succeed in email marketing with purchased lists. As part of the cleanup process, I start to ask questions […]

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Organizational security and doxxing

The security risks of organizational doxxing.  These are risks every email marketer needs to understand. As collectors of data they are a major target for hackers and other bad people. Even worse, many marketers don’t collect valid data and risk implicating the wrong people if their data is ever stolen. I have repeatedly talked about […]

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It’s not about the spamtraps

I’ve talked about spamtraps in the past but they keep coming up in so many different discussions I have with people about delivery that I feel the need to write another blog post about them. Spamtraps are … … addresses that did not or could not sign up to receive mail from a sender. … […]

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Linking identities to email addresses

As I predicted yesterday, a bunch of sites have popped up where you can input email addresses and find out if the address was part of the Ashley Madison hack. My spam trap address isn’t on it, which makes me wonder if unsubscribe data was kept elsewhere or if they just never bothered to save the […]

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Yes, Virginia, there is list churn

Yesterday I talked about how data collection, management, and maintenance play a crucial role in deliverability.  I mentioned, briefly, the idea that bad data can accumulate on a list that isn’t well managed. Today I’d like to dig into that a little more and talk about the non-permanence of email addresses. A common statistic used […]

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Data is the key to deliverability

Last week I had the pleasure of speaking to the Sendgrid Customer Advisory Board about email and deliverability. As usually happens when I give talks, I learned a bunch of new things that I’m now integrating into my mental model of email. One thing that bubbled up to take over a lot of my thought […]

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Email verification services

Just yesterday a group of delivery folks were discussing email verification services over IRC. We were talking about the pros and cons, when we’d suggest using them, when we wouldn’t, which ones we’ve worked with and what our experiences have been. I’ve been contemplating writing up some of my thoughts about verification services but it’s a […]

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Misdirected email

While this does seem to be more common with gmail addresses, it’s not solely limited to gmail. I’ve written about this frequently. Don’t leave that money sitting there. Sending mail to the wrong person, part eleventy. Email verification, what are we verifying. Recycled Yahoo addresses and PII leaks. Dr. Livingston, I presume. No, I’m really […]

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Growing your list carefully

Karl Murray wrote a great set of recommendations for growing an email marketing list. I really can’t think of anything I would have said differently. Touching customers and getting contact information from them is great, but there are situations where this gets bad addresses. Too many bad addresses can impact delivery. So how do you grow […]

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Sending mail to the wrong person, part eleventy

Another person has written another blog post talking about their experiences with an email address a lot of people add to mailing lists without actually owning the email address. In this case the address isn’t a person’s name, but is rather just what happens when you type across rows on they keyboard. These are similar […]

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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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