Email Routing Analyzer
Reconstruct an email's hop-by-hop delivery path from its Received headers, with the delay at each step and the slowest hop highlighted. Free, runs in your browser.
Analyse email routing
Paste the full raw headers to reconstruct the delivery path and per-hop delays.
What this routing analyzer does
Common use cases
- 1Diagnosing why an email arrived late
- 2Finding a server that is greylisting or queuing
- 3Mapping how mail flows between providers
- 4Confirming the true sending infrastructure
- 5Investigating spoofed or relayed messages
- 6Documenting a delivery path for a ticket
Related tools
About email routing
As an email travels, each server prepends a Received header recording where it came from, where it went next, and the time. Because they are prepended, the last Received line is the first hop. This tool reverses them into chronological order and computes the gap between each timestamp.
A large gap points to a server that queued, was greylisting, or was temporarily overloaded — the usual cause of "the email arrived an hour late". The slowest hop is highlighted so you know exactly where to look. All parsing happens in your browser.
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Got Questions? We Have Answers.
What does the routing analyzer do?
It reads the Received headers, orders them oldest-to-newest as the mail actually travelled, and calculates how long each hop took — highlighting the slowest one.
Why did my email arrive late?
A large gap between two hops means a server queued, greylisted or was overloaded at that point. The analyzer pinpoints exactly which hop introduced the delay.
How do I get the headers?
Use "Show original" in Gmail or "View source" in Outlook, then paste the full raw headers here.
Why are hops shown in reverse of the header order?
Received headers are prepended, so the last line is the first hop. The tool reverses them into true chronological order for you.
What is greylisting?
A spam-control technique that temporarily rejects unknown senders, forcing a retry minutes later. It commonly shows up as a delay at one hop.
Is anything uploaded?
No. The headers are parsed entirely in your browser and never leave your device.