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Category: Industry

Network glitches and corrupted VMs

I had a bit of a interesting Friday. I was so glad it was finally the weekend. Saturday we did a bunch of errands, including go visit our servers. See, we’ve been upgrading infrastructure to implement a second type of backup system. Saturday we were doing the last set of upgrades so we could install over the weekend. […]

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What a week!

Yesterday, after 5pm, I was so happy. I was telling folks to have a great weekend. To take time off and relax. Have fun! Don’t work! Enjoy the weather! Then someone pointed out it was only Thursday. But! I got up this morning and got lots of happy Facebook notifications from friends about how TODAY […]

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A DKIM primer resurrected

I was looking for some references today back in old blog posts. This means I discover some old links are dead, blog posts are gone or moved, and information is lost. In this case it’s a post by J.D. Falk on deliverability.com. The link is dead (it looks like the whole website is dead), but […]

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Podbox Expert Interview Series

Last month I did an interview with Podbox about email, deliverability and how I became an email expert (breaking things, lots of breaking things… and having to pick up the pieces and fix them…) Check out the interview over on their website. I’ve been thinking a lot about history and longevity. Next year will mark […]

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My panels from #EEC16

I had the privilege to be a part of two panels at EEC16, with some of the best folks in the business. The first panel was “Everything You Ever Wanted to Know About Deliverability, but Were Afraid to Ask.”   We had a lot of great audience questions. The first question, which was awesome (and I […]

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Insight into Gmail filtering

Last week I posted a link to an article discussing how Gmail builds defenses to protect their users from malicious mail. One of the things I found very interesting in that article was the discussion about how Gmail deploys many changes at once, to prevent people from figuring out what the change was. Let’s take a […]

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Ask Laura: Can you help me understand no auth / no entry?

Dear Laura, I’m a little confused by the term “no auth / no entry”. Gmail and other major receivers seem to be moving towards requiring authentication before they’ll even consider delivery. Does this just mean SPF and DKIM, or does this mean the much more stringent DMARC, as well? Thanks, No Shirt, No Shoes, No […]

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Thoughts on filters

One of the questions we received during the EEC16 closing keynote panel was why isn’t there a single blocklist that everyone uses and why don’t ISPs share data more. It would be so much easier for senders if every ISP handled mail the same as every other. But the world isn’t that simple, and it’s not […]

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Thoughts from #EEC16

EEC16 was my first Email Experience conference. I was very impressed. Dennis, Len, and Ryan put together a great program. I made it to two of the keynotes and both took me out of an email focused place to look at the bigger picture. Patrick Scissons discussed his experiences creating marketing and advertising campaigns for good and […]

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March 2016: The Month In Email

Happy April! I’m just back from the EEC conference in New Orleans, which was terrific. I wrote a quick post about a great session on content marketing, and I’ll have more to add about the rest of the conference over the next week or so. Stay tuned! Here’s a look at what caught our attention […]

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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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