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Every email carries its own delivery record. Paste the raw headers and read it: the hop-by-hop path with timing, the authentication verdicts your provider stamped on it, and the address mismatches scams depend on. Headers are personal — so they never leave this tab.
Analysed entirely in this tab — headers name you and your servers, which is exactly why they are not sent anywhere.
Paste into the editor or open a file — everything you add stays in this tab, and you see exactly what the tool will work on before anything runs.
Your browser does all the work locally. Nothing is uploaded — what you paste never leaves this tab, so there’s nothing for anyone to store, scan, or leak.
The answer appears on this page as you go. There is nothing to download, because the answer IS the page — screenshot it or write down what matters. Close the tab and nothing of what you pasted remains.