Sujit Khanal || Details

Secure Flask Email API — Multi-Account Gmail SMTP

A A secure Flask-based email API that supports sending HTML emails with attachments to multiple recipients using multiple Gmail SMTP accounts. Features include dynamic sender account selection, IP whitelist restrictions for added security, and .env-based configuration for easy setup and management.

API

Source Code

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Published

Aug. 14, 2025

Project Summery

A secure Flask-based email API using multiple Gmail SMTP accounts, with:

✅ HTML email support
✅ Multiple recipients
✅ File attachments
✅ Sender account selection (gmail1, gmail2, etc.)
✅ IP whitelist restriction
✅ Environment variable configuration via .env

🚀 Features

Send emails using your Gmail SMTP
Choose from multiple accounts dynamically
Add attachments
Restrict access using IP whitelisting
Configurable via .env

🛠️ Setup

1. Clone the project

git clone https://github.com/sujit-codezen/stmp-mail.git
cd flask-smtp-email-api

2. Install dependencies

python -m venv venv
source venv/bin/activate   # Windows: venv\Scripts\activate
pip install -r requirements.txt

3. Configure .env

# Gmail Account 1
GMAIL1_SMTP_SERVER=smtp.gmail.com
GMAIL1_SMTP_PORT=587
GMAIL1_EMAIL=your_account1@gmail.com
GMAIL1_PASSWORD=your_app_password_1

# Gmail Account 2
GMAIL2_SMTP_SERVER=smtp.gmail.com
GMAIL2_SMTP_PORT=587
GMAIL2_EMAIL=your_account2@gmail.com
GMAIL2_PASSWORD=your_app_password_2

# Allowed IPs (comma-separated)
ALLOWED_IPS=127.0.0.1,123.45.67.89

▶️ Running the Server

python app.py

Get Appointment

Flask SMTP Email API