Email Detective for Gmail: Identify ESPs & Check Authentication
See which ESP sent any email in Gmail. Detects 190+ providers and shows SPF/DKIM/DMARC authentication.
Time on the storeUnder a yearA rough range, not an exact date
Store users≈1KRounded by the Chrome Web Store
Chrome Web Store rating4.9 / 515 ratings on the Chrome Web Store
Last store update6 Oct 2026Version 2.1.207, 2 days ago
Inside the extension
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The maker
Tooltester S.L. has 3 listings on the store. Updates most of their listings often.
- Listings
- 3
- Combined store users
- ≈1.1K
- Store Featured
- 0
- Updated in the last 90 days
- 3 of 3
- Email Detective for Outlook: Identify ESPs & Check Authentication112 users · updated in the last day
- Sender Icons for Outlook: Spot important emails faster, click fewer ads6 users · updated 15 days ago
Combined users can count the same person more than once. See all 3 listings
Ext Watch AI
Should you build in this niche?
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