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Email Detective for Gmail: Identify ESPs & Check Authentication

Chrome extension by Tooltester · Productivity · Communication

  • Featured
  • Established publisher

A Chrome extension in Productivity · Communication with 1 000 users, a small but real audience. Audience over the last 30 days: unchanged.

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 (16 ratings)
Users, last 30 days
Unchanged (the store rounds this count to 1 000, so it moves only between steps)
Rating, last 30 days
Steady over 30 days
Version
2.1.308
Updated in the store
2026-10-30
Published
2026-03-23
Manifest
V3
Browser access
2 permissions

How it has moved

Users
unchanged since 02.10
1k-2k · 3 readings
2026-10-05: released 2.1.1942026-10-06: released 2.1.2072026-10-07: released 2.1.2112026-10-08: released 2.1.2162026-10-10: released 2.1.2332026-10-13: released 2.1.2372026-10-15: released 2.1.2432026-10-16: released 2.1.2462026-10-18: released 2.1.2532026-10-20: released 2.1.2572026-10-21: released 2.1.2632026-10-21: featured by the store2026-10-23: released 2.1.2712026-10-24: released 2.1.2722026-10-26: released 2.1.3022026-10-27: released 2.1.3032026-10-29: released 2.1.3052026-10-30: released 2.1.308
  1. 2026-10-091k
  2. 2026-10-242kreleased 2.1.272
  3. 2026-11-011k
Rating
unchanged since 02.10
reviewsrating 4.93-4.94 · 3 readings
2026-10-05: released 2.1.1942026-10-06: released 2.1.2072026-10-07: released 2.1.2112026-10-08: released 2.1.2162026-10-10: released 2.1.2332026-10-13: released 2.1.2372026-10-15: released 2.1.2432026-10-16: released 2.1.2462026-10-18: released 2.1.2532026-10-20: released 2.1.2572026-10-21: released 2.1.2632026-10-21: featured by the store2026-10-23: released 2.1.2712026-10-24: released 2.1.2722026-10-26: released 2.1.3022026-10-27: released 2.1.3032026-10-29: released 2.1.3052026-10-30: released 2.1.308
  1. 2026-10-09reviews16rating4.94
  2. 2026-10-24reviews16rating4.94released 2.1.272
  3. 2026-11-01reviews16rating4.94
Users
+81 since 31.08
919-2k · 8 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 2.1.152026-09-15: released 2.1.752026-09-16: released 2.1.942026-09-17: released 2.1.1202026-09-18: released 2.1.1282026-09-20: released 2.1.1332026-09-21: released 2.1.1372026-09-23: released 2.1.1452026-09-24: released 2.1.1502026-09-26: released 2.1.1602026-09-27: released 2.1.1682026-09-28: released 2.1.1762026-09-30: released 2.1.1812026-10-05: released 2.1.1942026-10-06: released 2.1.2072026-10-07: released 2.1.2112026-10-08: released 2.1.2162026-10-10: released 2.1.2332026-10-13: released 2.1.2372026-10-15: released 2.1.2432026-10-16: released 2.1.2462026-10-18: released 2.1.2532026-10-20: released 2.1.2572026-10-21: released 2.1.2632026-10-21: featured by the store2026-10-23: released 2.1.2712026-10-24: released 2.1.2722026-10-26: released 2.1.3022026-10-27: released 2.1.3032026-10-29: released 2.1.3052026-10-30: released 2.1.308
  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. 2026-10-091k
  7. 2026-10-242kreleased 2.1.272
  8. 2026-11-011k
Rating
unchanged since 31.08
reviewsrating 4.93-4.94 · 8 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 2.1.152026-09-15: released 2.1.752026-09-16: released 2.1.942026-09-17: released 2.1.1202026-09-18: released 2.1.1282026-09-20: released 2.1.1332026-09-21: released 2.1.1372026-09-23: released 2.1.1452026-09-24: released 2.1.1502026-09-26: released 2.1.1602026-09-27: released 2.1.1682026-09-28: released 2.1.1762026-09-30: released 2.1.1812026-10-05: released 2.1.1942026-10-06: released 2.1.2072026-10-07: released 2.1.2112026-10-08: released 2.1.2162026-10-10: released 2.1.2332026-10-13: released 2.1.2372026-10-15: released 2.1.2432026-10-16: released 2.1.2462026-10-18: released 2.1.2532026-10-20: released 2.1.2572026-10-21: released 2.1.2632026-10-21: featured by the store2026-10-23: released 2.1.2712026-10-24: released 2.1.2722026-10-26: released 2.1.3022026-10-27: released 2.1.3032026-10-29: released 2.1.3052026-10-30: released 2.1.308
  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. 2026-10-09reviews16rating4.94
  7. 2026-10-24reviews16rating4.94released 2.1.272
  8. 2026-11-01reviews16rating4.94

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing up to 2 times 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 2.1.308
  2. Version 2.1.305
  3. Version 2.1.303
Show the remaining 3
  1. Version 2.1.302
  2. Version 2.1.272
  3. Version 2.1.271

What changed recently

  1. Package size changed
  2. Store description rewritten
  3. Released version 2.1.308 (was 2.1.305)
Show the remaining 9
  1. Package size changed
  2. Store description rewritten
  3. Released version 2.1.305 (was 2.1.303)
  4. Package size changed
  5. Store description rewritten
  6. Released version 2.1.303 (was 2.1.302)
  7. Package size changed
  8. Store description rewritten
  9. Released version 2.1.302 (was 2.1.272)

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 2026-05-29 122 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 122 users ★ 5.0
  2. Sender Audit Describes nearly the same job, smaller audience 38 users ★ 5.0
  3. Gmail Sender Info Describes nearly the same job, smaller audience 57 users
  4. Email Provider & Outreach Risk Analyzer by GTM minute Describes nearly the same job, smaller audience 5 users
  5. Inbox Firewall Describes nearly the same job, smaller audience 1 users (last published figure)

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.

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Users and rating on Ext Ops Panel

Markdown

[![Users and rating on Ext Ops Panel](https://extops.dev/extensions/jmflpchhakbogamlbfmlkglnpgfbhidl/badge.svg)](https://extops.dev/extensions/jmflpchhakbogamlbfmlkglnpgfbhidl)

HTML

<a href="https://extops.dev/extensions/jmflpchhakbogamlbfmlkglnpgfbhidl"><img src="https://extops.dev/extensions/jmflpchhakbogamlbfmlkglnpgfbhidl/badge.svg" alt="Users and rating on Ext Ops Panel" height="20"></a>

Figures come from our own regular passes over the public Chrome Web Store listing, last read on . The store last changed these figures on 2026-11-01. We publish no contact details for extension developers.

Where the data comes from: how the catalog is built