This bot accesses your Gmail account only after you grant permission through Google OAuth. It is used only to read your inbox, send emails you ask for, and notify you of new messages inside Telegram.
Your OAuth tokens are stored privately on the bot's server and are never shared with, sold to, or disclosed to any third party. Email content is not stored; it is fetched on demand and shown only to you.
You can disconnect an account at any time from the bot, which deletes its stored token, or revoke access from your Google Account permissions page.