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PostMail – Email Open Tracker for Gmail & Outlook

Chrome extension by 25 HOLDINGS · Productivity · Communication

  • Trader

A Chrome extension in Productivity · Communication with 3 users, barely installed.

Specific sites only: 6 match patterns.

What the developer says about it

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

Users
3
Rating
not rated yet
Users, last 5 days
+3
Version
1.3.0
Updated in the store
2026-09-17
Published
2026-09-13
Manifest
V3
Browser access
2 permissions, 6 site patterns

How it has moved

Users
+3 since 14.09
0-3 · 4 readings
2026-09-14: appeared in the store2026-09-16: released 1.2.02026-09-18: released 1.3.0
  1. 2026-09-140appeared in the store
  2. 2026-09-151
  3. 2026-09-173
  4. 2026-09-183released 1.3.0
Users
+3 since 14.09
0-3 · 4 readings
2026-09-14: appeared in the store2026-09-16: released 1.2.02026-09-18: released 1.3.0
  1. 2026-09-140appeared in the store
  2. 2026-09-151
  3. 2026-09-173
  4. 2026-09-183released 1.3.0

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

Specific sites only: 6 match patterns.

  • https://mail.google.com/*
  • https://outlook.office.com/*
  • https://outlook.live.com/*
Show the remaining 3
  • https://outlook.office365.com/*
  • https://postmail.krishrp.xyz/*
  • https://*.googleusercontent.com/*
  • Watch the network requests your browser makes webRequest
  • Store data in your browser storage

The full permission history for this extension

Version history

  1. Version 1.3.0 · Asked for more permissions (8, was 6)
  2. Version 1.2.0

What changed recently

  1. Package size changed
  2. Asked for more permissions (8, was 6)
  3. Store description rewritten
Show the remaining 4
  1. Released version 1.3.0 (was 1.2.0)
  2. Package size changed
  3. Released version 1.2.0 (was 1.1.0)
  4. Appeared in the store

The publisher

25 HOLDINGS.

Like this one

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

  1. Email Open Tracker – Unlimited Real-Time Gmail Read Receipts & Tracking Describes nearly the same job, smaller audience 149 users ★ 4.8
  2. MailViewed - Free Email Tracker for Gmail Describes nearly the same job, smaller audience 87 users ★ 5.0
  3. Seenly — Email Open Tracker Describes nearly the same job, smaller audience 6 users (last published figure) ★ 5.0
  4. SentSonar — Accurate Email Open Tracking Describes nearly the same job, smaller audience 7 users ★ 5.0
  5. Email Tracker for Gmail by Makeinfo Describes nearly the same job, smaller audience 9 users

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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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.