DMARC

What is DMARC?

DMARC is an email authentication protocol that helps protect your domain from being used in phishing and spoofing attacks. It builds on two existing mechanisms: SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail).

Recent Changes for Email Providers

Recently, major email providers like Yahoo have updated their policies to strengthen email security. These changes mean that emails sent from your domain without proper DMARC setup may be rejected or marked as spam. This can significantly impact your email deliverability and the effectiveness of your communications.

Setting Up DMARC

Setting up DMARC involves adding a DNS record to your domain. Here’s a simple example of a DMARC record:

v=DMARC1; p=none; rua=mailto:postmaster@yourdomain.com

This record does the following:
  • v=DMARC1: Indicates the version of DMARC.
  • p=none: Specifies the policy. In this case, “none” means no action is taken, but reports are sent.
  • rua=mailto:postmaster@yourdomain.com: Defines where aggregate reports should be sent.

Importance of SPF

SPF is a key part of DMARC. It specifies which mail servers are allowed to send emails on behalf of your domain. To ensure all your email sending apps continue to work correctly, your SPF record must include all the IP addresses or sending services you use.

Here’s an example of an SPF record:

v=spf1 include:mail.yourdomain.com -all

This record tells the receiving mail server that only the listed servers are authorized to send emails from your domain.

Why DMARC and SPF Matter

In summary, setting up DMARC and ensuring your SPF records are correct is essential for email security and deliverability. It’s a small step that can make a big difference in protecting your domain and ensuring your emails get through.

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