Prevents accidental email mis-sends to unintended external recipients by displaying a warning confirmation dialog when multiple external-domain recipients are detected, allowing users to cancel, convert to Bcc, or proceed

User composes an email in Gmail → clicks Send → extension intercepts the send action → checks recipients against configured policies → if multiple external-domain addresses detected, displays a warning dialog with options (convert to Bcc, cancel, or proceed with send) → optionally sends email data to server for AI review → user makes a choice to finalize or cancel the email

Target users: Gmail users concerned about accidental mis-sends / Corporate/enterprise Gmail users handling sensitive communications / Google Workspace administrators implementing organizational email safety policies

Paid version details are described only in the store listing (in Japanese); the actual paid feature gating happens server-side at safe-gmail.appspot.com
Cannot determine exact pricing or payment mechanism from the extension source alone
The AI review feature (mailReview endpoint) behavior for free vs paid users cannot be fully determined from client-side code

Monetization

Unknown

No monetization details are available yet.

Confidence: 0
Payment platform: --
Source: None / High
Login required: No
Reason: The extension does not implement its own login flow. It operates as a content script injected into Gmail (mail.google.com) and scrapes the already-logged-in user's email address from the Gmail page via DOM elements (findUserEmail() in main.js:1261). The extension requires the user to be logged into Gmail, but that is a prerequisite of using Gmail itself, not a requirement imposed by the extension. No separate account creation or authentication is needed to use the extension's features.

Permission risk

Medium-risk permissions

This estimate uses declared permissions and host permissions to assess access scope and sensitivity.

扩展能力较强：storage

Publisher

Systena Corporation

SYSTENA CORPORATION

Email: [email protected]
Phone: +818020809383
Address: 1-2-20, KAIGAN SHIODOME BLDG.14F. MINATO-KU, 東京都 105-0022 JP

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Permissions

Host access