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Email Detective for Gmail: Identify ESPs & Check Authentication

Chrome extension by Tooltester · Productivity · Tools

  • Established publisher

A Chrome extension in Productivity · Tools with 1 000 users, a small but real audience.

No site access is declared in the manifest, so it cannot read the pages you open on its own.

What the developer says, and 8 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
1 000
Rating
4.9 (15 ratings)
Users, last 15 days
+81
Rating, last 30 days
Not watched long enough to say
Version
2.1.15
Updated in the store
2026-09-11
Published
2026-03-23
Manifest
V3
Browser access
2 permissions

How it has moved

Users
+81 since 31.08
919-1k · 6 readings
2026-09-04: released 2.1.02026-09-05: released 2.1.22026-09-07: released 2.1.62026-09-08: released 2.1.92026-09-09: released 2.1.122026-09-10: released 2.1.132026-09-11: released 2.1.15
  1. 2026-08-31919
  2. 2026-09-02931
  3. 2026-09-05962released 2.1.2
  4. 2026-09-06954
  5. 2026-09-071kreleased 2.1.6
  6. 2026-09-141k
Rating
unchanged since 31.08
reviewsrating 4.93 · 6 readings
2026-09-04: released 2.1.02026-09-05: released 2.1.22026-09-07: released 2.1.62026-09-08: released 2.1.92026-09-09: released 2.1.122026-09-10: released 2.1.132026-09-11: released 2.1.15
  1. 2026-08-31reviews15rating4.93
  2. 2026-09-02reviews15rating4.93
  3. 2026-09-05reviews15rating4.93released 2.1.2
  4. 2026-09-06reviews15rating4.93
  5. 2026-09-07reviews15rating4.93released 2.1.6
  6. 2026-09-14reviews15rating4.93
Users
+81 since 31.08
919-1k · 6 readings
2026-09-04: released 2.1.02026-09-05: released 2.1.22026-09-07: released 2.1.62026-09-08: released 2.1.92026-09-09: released 2.1.122026-09-10: released 2.1.132026-09-11: released 2.1.15
  1. 2026-08-31919
  2. 2026-09-02931
  3. 2026-09-05962released 2.1.2
  4. 2026-09-06954
  5. 2026-09-071kreleased 2.1.6
  6. 2026-09-141k
Rating
unchanged since 31.08
reviewsrating 4.93 · 6 readings
2026-09-04: released 2.1.02026-09-05: released 2.1.22026-09-07: released 2.1.62026-09-08: released 2.1.92026-09-09: released 2.1.122026-09-10: released 2.1.132026-09-11: released 2.1.15
  1. 2026-08-31reviews15rating4.93
  2. 2026-09-02reviews15rating4.93
  3. 2026-09-05reviews15rating4.93released 2.1.2
  4. 2026-09-06reviews15rating4.93
  5. 2026-09-07reviews15rating4.93released 2.1.6
  6. 2026-09-14reviews15rating4.93

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

No site access is declared in the manifest, so it cannot read the pages you open on its own.

  • Run its own code on the pages it can access scripting
  • Store data in your browser storage

The full permission history for this extension

Version history

  1. Version 2.1.15
  2. Version 2.1.13
  3. Version 2.1.12
Show the remaining 3
  1. Version 2.1.9
  2. Version 2.1.6
  3. Version 2.1.2

What changed recently

  1. Package size changed
  2. Store description rewritten
  3. Released version 2.1.15 (was 2.1.13)
Show the remaining 9
  1. Package size changed
  2. Store description rewritten
  3. Released version 2.1.13 (was 2.1.12)
  4. Package size changed
  5. Store description rewritten
  6. Released version 2.1.12 (was 2.1.9)
  7. Package size changed
  8. Store description rewritten
  9. Released version 2.1.9 (was 2.1.6)

Older entries and the full day by day series are in the app.

The publisher

Tooltester publishes 3 listings we track, 1k users between them. Listed website: emailtooltester.com.

  1. Email Detective for Outlook: Identify ESPs & Check Authentication Tooltester · Productivity · Tools · published 2026-05-29 112 users ★ 5.0
  2. Sender Icons for Outlook: Spot important emails faster, click fewer ads Tooltester · Productivity · Communication · published 2026-07-15 9 users

Like this one

Listings the catalog judges closest in what they say they do.

  1. Email Detective for Outlook: Identify ESPs & Check Authentication Describes nearly the same job, smaller audience 112 users ★ 5.0
  2. Email Provider & Outreach Risk Analyzer by GTM minute Describes nearly the same job, smaller audience 5 users
  3. Gmail Sender Info Describes nearly the same job, smaller audience 43 users
  4. Mailrith - Email Deliverability Tester Describes a similar job, smaller audience 6 users
  5. SPFWise: Email Security & DMARC Checker Describes a similar job, smaller audience 7 users ★ 5.0

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

Is this your extension?

Connect it to Ext Ops Panel and see installs, uninstalls and uninstall reasons as events arrive, not as a weekly summary.

See what the panel does

Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.