email-headers

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headerhound-dev / headerhound

An open, community-maintained filter list that identifies cold-outreach sending platforms (Instantly, Smartlead, Apollo, and more) from email headers. EasyList, but for cold email.

gmail anti-spam spam-detection email-security filter-list apps-script cold-emails cold-email cold-outreach email-filtering cold-email-outreach email-headers

Updated Aug 14, 2026
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