When it comes to email security, DMARC (Domain-based Message Authentication, Reporting, and Conformance) is a key player. One of the main things DMARC focuses on is the RFC5322.From address in an email. But what does this mean, and why is it important? Let’s break it down.

What is the RFC5322.From Address?

The RFC5322.From address is the email address that appears in the ‘From’ field of an email. It’s the address that you see when you receive an email, and it’s supposed to represent who sent the email.

Why Does DMARC Focus on the RFC5322.From Address?

Even though it’s been easy to fake the ‘From’ address in emails throughout the history of email, DMARC still focuses on the RFC5322.From address for a few reasons:

  1. It’s always there: Every email has to have a ‘From’ address. This makes it a reliable point of reference for checking the authenticity of an email.
  2. It’s what you see: Most email programs (also known as mail user agents, or MUAs) display the ‘From’ address in a way that suggests it represents the true sender of the email. This makes it a logical choice for an identifier to focus on.

What Happens if There’s No RFC5322.From Address?

If an email doesn’t have a properly formed ‘From’ address, it’s considered invalid. DMARC doesn’t provide guidelines for handling these kinds of emails.

What About Emails with Multiple Authors?

DMARC is typically used to protect emails that only have one author. So, in the context of DMARC, the ‘From’ field is generally expected to contain only one email address.

Remember, this is a simplified explanation. In reality, email security involves a lot of complex processes and technologies. But hopefully, this gives you a basic understanding of why DMARC focuses on the RFC5322.From address.

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