Email Authentication
Why Is SPF Flattening Relevant? SPF has a limit of 10 DNS Lookups; any mechanism (entry) requiring a lookup after the lookup limit will not be evaluated and will fail authentication. In some cases, people turn to SPF flattening tools to work around the 10 DNS lookup limit. When you add a new mechanism in your record, you require a new DNS lookup. The more services and third-parties that send on your behalf, the more complicated and bloated your record can become. SPF record flattening can be an easy answer, but is not the safest route. How Does SPF Flattening Work? In SPF Flattening, hostnames are converted to IP addresses, which don’t count in the DNS lookup tally. Then you create your SPF records using the IP addresses instead of the hostnames. dmarcian developed SPF flattening as an experiment to work around the DNS lookup limit. In IETF’s RFC 7208
In this article, we present a guide on deploying DMARC on Cisco’s Email Security Appliance(ESA). If you believe that you already have your system’s DMARC authentication and reporting set up correctly, please take the time to read through the information and compare it to your current settings. These settings are industry best practices, and we encourage you to not diverge from them. Your ESA’s AsyncOS version should be 13+. If 14, it should be 14.0.2 or greater due to a bug in lower versions of 14. NOTES: If you don’t set this up correctly, please don’t set it up at all. If it isn’t configured correctly, you’ll pollute valid data being sent from other sources, and your DMARC data may be blacklisted by aggregators. Varying settings from the recommendations in how or whether your environment performs SPF or DKIM verification will affect the ability of the system to perform adequate
Back in October 2019, Microsoft included ARC support in their Microsoft 365 Roadmap, stating that “[ARC] is now enabled for Office 365 hosted mailboxes.” But at that time it could only be used between Office 365 tenants, or from Microsoft’s in-house services. However in June of 2022 they made it possible for each tenant to […]
Back in October 2019, Microsoft included ARC support in their Microsoft 365 Roadmap, stating that “[ARC] is now enabled for Office 365 hosted mailboxes.” But at that time it could only be used between Office 365 tenants, or from Microsoft’s in-house services. However in June of 2022 they made it possible for each tenant to […]
In June 2021 we published research on DMARC adoption among the top 100 companies in Canada. Twenty months later, we evaluated the DMARC adoption rate and are excited to share those rosy results. Here’s the DMARC adoption rate comparison for Canada’s top 100 countries, measured in percentage increase or decrease, from June 2021 to February 2023: 154% increase of DMARC policies set to p=reject 114% increase of DMARC policies set to p=quarantine 18% decrease of DMARC policies set to p=none 57% decrease of companies lacking a DMARC policy Above all, a fifth of the top Canadian companies advanced their DMARC policies to the ultimate goal of a p=reject DMARC policy. With a p=reject policy in place, emails failing DMARC authentication aren’t delivered to the destined inbox. Another fifth took the initial step in securing their domains by establishing DMARC records. People typically begin their road to DMARC compliance by employing
This guide describes the process for configuring Sendinblue to send DMARC compliant messages. You will need to configure this source, and others you authorize, before advancing your DMARC policies to a more restrictive state, e.g., quarantine and/or reject. To bring this source into DMARC compliance, you will need access to Sendinblue’s administrative account and the domain’s DNS management console. From time to time, these instructions change with very little advance notice. Please always refer to documentation hosted by Sendinblue for the most complete and accurate information. General informationSendinblue provides a platform to send transactional and marketing emails. It is often used to send B2C (business-to-consumer) and B2B (business-to-business) emails. Many areas in your organization may use this service, including marketing, sales, and finance. Sendinblue supports DMARC compliance through DKIM and SPF alignment. DKIMTo configure DKIM, you will need to access the domain’s settings. There are two ways to do this:
The fifth JPAAWG General Meeting was held on November 7th and 8th in Nagasaki, Japan. For the first time since the start of the COVID-19 pandemic, DMARC.org was able to deliver a keynote presentation in person. A strong conference program generated excellent attendance, both in-person and online, and the facilities were top notch. This year’s […]
The fifth JPAAWG General Meeting was held on November 7th and 8th in Nagasaki, Japan. For the first time since the start of the COVID-19 pandemic, DMARC.org was able to deliver a keynote presentation in person. A strong conference program generated excellent attendance, both in-person and online, and the facilities were top notch. This year’s […]
This guide describes the process for configuring Mailgun to send DMARC-compliant messages. You will need to configure this source, and others that send on your behalf, before advancing your DMARC policies to a more restrictive state, e.g., quarantine and/or reject. To bring this source into DMARC compliance, you will need access to the Mailgun administrative account and the domain’s DNS management console. From time to time, these instructions change with very little advance notice. Please always refer to documentation hosted by Mailgun for the most complete and accurate information. General informationMailgun provides an email delivery service that allows developers to integrate email into applications through APIs and SMTP. Many departments may use this service in your organization, but it is often managed by an application development team. Mailgun supports DMARC compliance through SPF and DKIM alignment. SPF & DKIMTo configure SPF and DKIM: In the Mailgun console, navigate to Sending>Overview
This guide describes the process for configuring Mailchimp Transactional to send DMARC-compliant messages. You will need to configure this source, and others that send on your behalf, before advancing your DMARC policies to a more restrictive state, e.g., quarantine and/or reject. To bring this source into DMARC compliance, you will need access to the Mailchimp Transactional administrative account and the domain’s DNS management console. From time to time, these instructions change with very little advance notice. Please always refer to documentation hosted by Mailchimp Transactional for the most complete and accurate information. General informationMailchimp Transactional is a paid Mailchimp add-on that allows clients to send one-to-one transactional emails triggered by user actions, such as purchases or account activity. Sales and marketing as well as development teams may use this service in your organization. Mailchimp Transactional supports DMARC compliance through DKIM and SPF alignment. DKIMTo configure DKIM: Navigate to Settings in