Yahoo Changes DMARC Policy, Ruins Email

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Last week, Yahoo made a change to their DMARC policy. DMARC stands for Domain-based Message Authentication, Reporting and Conformance. It is an email authentication method meant to curb spoofing of email addresses and other abuses. On the surface, this change seems like it might be a positive one. After all, who among us does not hate email abuse? But in practice, the change had a lot of unintended consequences.

The change that Yahoo made no longer allows their emails to be sent from outside of their system. What that means in practice is that if you send an email from a yahoo address to an email address whose provider checks against DMARC (which is most reputable email providers), the email will not get through.

You may never be affected by the DMARC change, then again, you may have already been affected and not even known about it. If you sent an email from a yahoo email address in the last week to Alarm Grid, for example, we didn't get it. The reason is that when you send an email to, the way it works is that it goes from your email to a ticketing system, that ticketing system then forwards your email to our techs who use Gmail. Gmail sees that your email was sent from a Yahoo address, but that it was forwarded from our ticketing system, checks the DMARC policy, then rejects your email because it wasn't sent directly from the Yahoo address.

As you can imagine, this has been a major headache for us being that we are absolutely 100% about customer service, and this change has caused us to miss a massive numbers of questions and requests from our customers. So we wanted to apologize to anyone who sent us an email in the last week from a Yahoo address. We were not trying to ignore you, we simply did not see your email. If you are one of Alarm Grid's customers that this affected, you should be receiving a response to your message promptly as they are sitting in our ticketing system and we are auditing missed messages as we speak.

That said, since Yahoo seems to be uncommitted to resolving the havoc-wreaking issue caused by their change, even lauding this adjustment as a pioneering change that the rest of the industry is sure to follow, we recommend that you strongly consider changing your email from Yahoo to a provider that, as of yet, has not made unilateral decisions that break the way most people use the internet. Internally at Alarm Grid, we use Gmail. It is free, its storage capacity is incredibly large, and it's functionality is better than any paid service we have yet seen. Even so, there are plenty of other services out there that are both free and very functional. Going forward, while we will do our best to make sure that all emails are answered, it is our belief that your life will be made much easier if you begin the search for a new email provider.