Installation

Requirements

• Python 3.10+ (supports Python 3.10, 3.11, 3.12, 3.13, and 3.14)
• Flask 3.1+

Using pip

# Create and activate virtual environment
python3 -m venv .venv
source .venv/bin/activate

# Install Flask-Mailing
pip install flask-mailing

With Optional Dependencies

# With email checking utilities (Redis, DNS validation)
pip install flask-mailing[email-checking]

# Full development setup
pip install flask-mailing[dev,email-checking]

Using source code

git clone https://github.com/marktennyson/flask-mailing && cd flask-mailing
pip install -e ".[dev,email-checking]"

Core Dependencies

Package	Version	Purpose
aiosmtplib	≥4.0.2	Async SMTP client
flask	≥3.1.0	Web framework
pydantic	≥2.11.0	Data validation
pydantic-settings	≥2.9.0	Settings management
email-validator	≥2.3.0	Email validation
jinja2	≥3.1.6	Template engine

Optional Dependencies

Package	Version	Purpose
redis	≥5.3.0	Email checking with Redis
httpx	≥0.28.1	HTTP-based email validation
dnspython	≥2.8.0	DNS-based validation