Smart Email Auto-Reply System

Problem

Small businesses and freelancers answer the same questions by email every day: prices, availability, order status, opening hours. An email assistant should sort incoming mail into categories and prepare a reply for business inquiries, using only facts the business has provided.

Constraints

• Works with an existing mailbox (for example Gmail) without moving to a new tool.

• Replies are drafts that a person reviews and sends; nothing is sent automatically.

• Newsletters, spam, automated notifications and personal mail get no reply.

• Prices, dates and stock levels must never be invented.

Goals

• Every unread business inquiry has a categorized reply draft in its thread within 15 minutes.

• Drafts need no factual corrections in at least 9 out of 10 cases during a two-week review.

• No replies are drafted for newsletters, spam or automated mail in the review sample.

• Time spent on routine replies drops by half, measured over a typical week.

Solutions

• Gmail Auto-Reply Drafts with OpenAI (OpenAI API, Gmail API, Google OAuth 2.0, Pydantic) – A Python script that connects to Gmail through the official Gmail API (OAuth2) and uses the OpenAI Responses API to categorize unread emails and write reply drafts. Structured output with a Pydantic…