email spoofing and SPF/DKIM/DMARC header validator — free browser tool | fatcousin | fatcousin

tools→browse every utility in one place.manifesto→why fatcousin exists — local-first, no uploads.

ready

local

// fatcousin · local process monitor

00:00:00

// session started —

// tool · email-spoofing-spf-dkim-validator

// origin · —

// user agent · —

// verdict · files processed locally · verify by watching NET events below

▮

NET · no outbound requests · all processing local

this panel shows everything. if something looks wrong, it is wrong. that's the contract.

paste headers or drop eml · parse Authentication-Results · Received-SPF · local spoofing heuristics · no network DNS · runs locally

[paste headers]

header-only validation — no live SPF/DKIM DNS checks

[drop .eml]

drop .eml

or click

Select file

paste headers or drop .eml — local heuristics only, no DNS lookups