Tagdmarc

Gmail Program for Election Mail

A few months ago, Google made a splash in the political press and the email marketing space when they asked the FEC the following question: May Google launch a free and non-partisan pilot program to test Gmail design features, which will be open to authorized candidate committees, political party committees, and leadership political action committees, where spam detection as applied to messages...

Authentication at Office365

This is a followup from a post a few weeks ago about authentication changes at Office365. We have some more clarity on what is going on there. This is all best information we have right now. Microsoft is now requiring authentication to match the visible from address in order to reach the inbox at Office365. That means, either the SPF domain or the DKIM domain must align (in the DMARC sense) to...

Some Microsoft thoughts

Right at the end of January, Microsoft appears to have made couple of changes to how they’re handling authentication. The interesting piece of this is that, in both cases, Microsoft is taking authentication protocols and using them in ways that are slightly outside the spec, but are logical extensions of the spec. The first is an extension of DMARC. They’re rolling out inbox flags for...

Cost of authentication

At the end of last year, Steve wrote a post about the different types of authentication. I thought I’d build on that and write about the costs associated with each type. While I know a lot of my readers are actually on the sending side, I’m also going to talk about the costs associated with the receiving side and a little bit about the costs for intermediaries such as CRM systems or...

Authentication

Some notes on some of the different protocols used for authentication and authentication-adjacent things in email. Some of this is oral history, and some of it may be contradicted by later or more public historical revision. SPF Associates an email with a domain that takes responsibility for it. Originally Sender Permitted From, now Sender Policy Framework. It allows a domain owner to announce...

Why is DMARC failing?

Multiple times over the last few weeks folks have posted a screenshot of Google Postmaster tools showing some percentage of mail failing DMARC. They then ask why DMARC is failing. Thanks to how DMARC was designed, they don’t need to ask anyone this, they have all the data they need to work this out themselves. The DMARC protocol contains a way to request reports when DMARC authentication...

Should you publish a DMARC policy statement?

DMARC is a protocol that makes it very, very simple to shoot yourself in the foot. Setup is tricky and if you don’t get it exactly right you risk creating deliverability problems. The vast majority of companies SHOULD NOT publish a DMARC policy with p=reject or p=quarantine for their existing domains. DMARC policy statements are, essentially, a way for a company to assert the following...

DMARC doesn’t fix phishing

Over the last few weeks I’ve had a lot of discussions with folks about DMARC and the very slow adoption. A big upsurge and multiple Facebook discussions were triggered by the ZDNet article DMARCs abysmal adoption explains why email spoofing is still a thing. There are a lot of reasons DMARC’s adoption has been slow, and I’m working on a more comprehensive discussion. But one of...

Gradual DMARC Rollout

Over on twitter Alwin de Bruin corrected me on an aspect of DMARC soft rollout I’d entirely forgotten about. It’s useful, so I thought I’d write a quick post about it. If you have a large mail stream and you want to avoid the Scary Red Flag Day when you turn on DMARC p=reject enforcement and wait for people to complain you can use the DMARC policy “pct=” tag to roll...

Good morning DMARC

I’m thinking I may need to deploy DMARC report automation sooner rather than later.

… and so on, and on, and on for a lot further down the mailbox.

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