Maillifier

What Maillifier is

Maillifier is a free, open-source Google Apps Script project that processes emails forwarded to a dedicated Gmail account and prepares AI-drafted replies using Google Gemini. The maker says a draft typically arrives within 1–5 minutes. It drafts but does not automatically send messages, leaving the sending decision to the user.

Users can tailor future drafts with the #SET_USER_PROMPT email command and provide company information and tone guidance in a Google Doc used as a Knowledge Base. Maillifier detects the sender’s language and drafts a reply in that language. Its home page lists support for PDF, DOCX, XLSX, and CSV attachments, as well as charts and more. Administrators can whitelist users and change their access through email commands.

The installed script uses Google Apps Script with Gmail, Google Drive, Google Docs, Google Sheets, and the Google Gemini API. The maker says the script processes data within the user’s Google account and sends email content to Gemini for AI processing. Its privacy policy says processed emails are permanently deleted after a response is generated. Security measures listed include split-scope installation, HTTPS/TLS communication, encrypted Gemini API keys in Google Script Properties, whitelist access control, and publicly auditable source code.

Who it suits

Maillifier suits Gmail users who want help triaging forwarded email and drafting replies while retaining control of sending. It may also suit teams that want to provide shared company guidance and manage access with an administrator whitelist.

Limits

The Free plan costs nothing. Gemini API free-tier rate limits may be exceeded; users can wait or set up Google Cloud billing. Maillifier drafts replies but does not automatically send them.

Getting started

1. Open maillifier.com.
2. Use a Google account with Gmail access.
3. Install the Google Apps Script project using the split-scope installation.
4. Obtain and manage your own Gemini API key.
5. Forward emails to the dedicated Gmail account.
6. Add company information and tone guidelines to a Google Doc if needed.
7. Set personal drafting rules with the #SET_USER_PROMPT email command if needed.

Verdict

Choose Maillifier if you want free, Gmail-based triage and AI-drafted replies while keeping sending under your control. It requires your own Gemini API key, and its free-tier rate limits may be exceeded; users can wait or set up Google Cloud billing in that case.