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Author: steve

Tools!

I just added a DMARC validation tool over on tools.wordtothewise.com. You can give it a domain – such as ebay.com – and it will fetch the DMARC record, then explain and validate it. Or you can paste the DMARC record you’re planning to publish into it,  to validate it before you go live. If you’ve not […]

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The twilight of /8s

A “/8” is a block of 16,777,214 usable IP addresses. That’s a big fraction of the entire IPv4 address space – about 1/224, in fact. Each one is all the addresses that begin with a given number: 10.0.0.0/8 is all the IP addresses that begin with “10.”, “184.0.0.0/8” (or “184/8” for short) is all the […]

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A due diligence story

due diligence noun. research and analysis of a company or organization done in preparation for a business transaction It’s a term that’s been around for five centuries or so. Originally it meant the effort that was necessary for something, but it evolved into a legal term for “the care that a reasonable person takes to avoid […]

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Why so many IP addresses?

Hi Laura, Merry Xmas and wishing you a Happy New Year! I recently looked at a popular ESP’s IPv4 space and I was astounded. How does an ESP get an IP allocation of 20,480 IPs? ARIN guidelines do not allow “MX/Mailing” IPs to count towards a valid justification especially in the case when each and […]

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Google and Amazon and B2B spam

Many of the operational goals of a commercial spammer aren’t related to email delivery at all, rather they revolve around optimizing ROI and minimizing costs. That’s even more true when the spammer isn’t trying to sell their own product, rather they’re making money by sending spam for other companies. Most legitimate network providers pay at […]

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Is your website up? Are you sure?

“What would you do for 25% more sales?” It’s panicked gift-buying season, and I got mail this morning from Boutique Academia, part of their final push before Christmas. They’re hoping for some Christmas sales in the next three days. They do make some lovely jewelry – ask Laura about her necklace some time – so […]

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DKIM Canonicalization – or – why Microsoft breaks your mail

One of these things is just like the other Canonicalization is about comparing things to see if they’re the same. Sometimes you want to do a “fuzzy” comparison, to see if two things are interchangeable for your purposes, even if they’re not exactly identical. As a concrete example, these two email addresses: (Steve) steve@wordtothewise.com “Also Steve” […]

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Global Suppression Lists

Global Suppression List. Pander File. Screamers List. Whatever you call it, it’s the list of email addresses you suppress from every mailing. If you’re an ESP, this is the list of people who you never, ever want to send email to – and I’m talking about ESP-wide global suppression lists here, not the suppression lists […]

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Traffic Light Protocol

If you’re sharing sensitive computer security information it’s important to know how sensitive a document is, and who you can share it with. US-CERT and many other security organizations use Traffic Light Protocol as shorthand for how sensitive the information in a document is. It’s simple and easy to remember with just four colour categories: Red, Amber, […]

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Spam, campaign statistics and red flag URLs

It’s not often spammers send me their campaign statistics, but on Tuesday one did. The spam came “from” news@udemy.com, used udemy.com in the HELO and message-ids and, sure enough, was advertising udemy.com:   Received: from udemy.com (unknown [198.20.115.217]) by … From: Udemy <news@udemy.com> Subject: The Photoshop Secret – Master Adobe Photoshop like a Pro! Message-ID: <20160706031012.1E35F28A6B081174@udemy.com> […]

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  • OTA joins the ISOC

    The Online Trust Alliance (OTA) announced today they were joining forces with the Internet Society (ISOC). Starting in May, they will operate as an initiative under the ISOC umbrella. “The Internet Society and OTA share the belief that trust is the key issue in defining the future value of the Internet,” said Internet Society President and CEO, Kathryn Brown. “Now is the right time for these two organizations to come together to help build user trust in the Internet. At a time when cyber-attacks and identity theft are on the rise, this partnership will help improve security and data privacy for users,” added Brown.No Comments


  • Friday blogging... or lack of it

    It seems the last few Friday's I've been lax on posting. Some of that is just by Friday I'm frantically trying to complete all my client deliverables before the weekend. The rest of it is by Friday I'm just tired. Today had the added complication of watching the Trumpcare debate and following how (and how soon) it would affect my company if it passed. That's been a bit distracting, along with the other stuff I posted about yesterday. I wish everyone a great weekend.1 Comment


  • Indictments in Yahoo data breach

    Today the US government unsealed an indictment against 2 Russian agents and 2 hackers for breaking into Yahoo's servers and stealing personal information. The information gathered during the hack was used to target government officials, security employees and private individuals. Email is so central to our online identity. Compromise an email account and you can get access to social media, and other accounts. Email is the key to the kingdom.No Comments


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