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Email header analyzer

Read authentication and routing details from pasted email headers.

What the analyzer reads

Paste the raw header block to see Authentication-Results, From, Return-Path, Reply-To, Message-ID, date, and the number of Received hops.

Use the final receiver's result

Authentication-Results added by the mailbox that received the message is the most useful result. Forwarding can change SPF while DKIM may continue to pass.

Common questions

Are pasted headers stored?

No. They are processed for this request and are not written to the zaSend database.

Why are authentication results missing?

Some copied header views omit Authentication-Results. Open the message's original or raw source and copy the complete header block.