Question 1

What does this email header analyzer extract?

Accepted Answer

This email header analyzer parses raw RFC 5322 headers, summarizes SPF, DKIM, and DMARC results, maps the Received chain, and groups the remaining headers so incident review starts from a structured output instead of a wall of text.

Question 2

When should I analyze email headers?

Accepted Answer

Use header analysis during delivery incidents, after infrastructure changes, or when a message lands unexpectedly. Headers are usually the fastest source of truth for auth, routing, and timing questions.

Question 3

What is the most important part of the result?

Accepted Answer

Start with Authentication-Results and the Received chain. That usually tells you whether the message failed sender policy, took an unexpected route, or encountered delays between relays.

Question 4

Does this replace deliverability testing?

Accepted Answer

No. Header analysis explains what happened to a specific message. It is strongest when paired with sender-auth checks and controlled inbox testing for repeatable validation.

Free email header analyzer and email header parser

Paste raw headers and inspect the message path