Installation

This page covers installing aspose-email-foss 26.3 into a Python project. The package is a pure-Python library with no native dependencies — no Microsoft Office, no COM interop, no platform extensions. A standard pip install is all that is required.

Prerequisites

Requirement	Detail
Python	3.10 or later (`python --version` to check)
pip	Included with modern Python installations
Operating system	Windows, macOS, or Linux — no platform restrictions

If you are on Python 3.9 or earlier, upgrade to 3.10+ before proceeding. The library uses structural pattern matching and match/case syntax introduced in Python 3.10.

Install via pip

pip install aspose-email-foss

This fetches the latest stable release from PyPI. To pin a specific version:

pip install "aspose-email-foss==26.3"

To upgrade an existing installation:

pip install --upgrade aspose-email-foss

Virtual Environment Setup

Using a virtual environment is recommended for any project. It isolates the package from system-wide Python and avoids dependency conflicts between projects.

python -m venv .venv
source .venv/bin/activate   # Linux/macOS
# .venv\Scripts\activate    # Windows (Command Prompt)
# .venv\Scripts\Activate.ps1  # Windows (PowerShell)
pip install aspose-email-foss

The virtual environment only needs to be created once per project. Activate it at the start of each terminal session before running your scripts.

Verify the Installation

After installing, confirm the package loads correctly by running a minimal test. The create() class method builds a new MapiMessage in memory without reading any file, making it a reliable smoke test with no side effects.

from aspose.email_foss.msg import MapiMessage

msg = MapiMessage.create("Test subject", "Test body")
print(f"Subject: {msg.subject}")

If you see the subject printed without errors, the package is installed and importable correctly.

Troubleshooting

ModuleNotFoundError: No module named 'aspose'

The package is installed into a different environment than the one running your script. Check that which python (Linux/macOS) or where python (Windows) points to the same interpreter you used for pip install. If you are using a virtual environment, ensure it is activated.

ModuleNotFoundError: No module named 'aspose.email_foss'

The top-level aspose namespace exists (from another Aspose package) but email_foss sub-package was not found. Run pip install aspose-email-foss again in the correct environment.

ImportError on Python 3.9

The library requires Python 3.10 or later. Upgrade your Python installation.

Proxy or offline environments

For air-gapped installations, download the wheel from PyPI and install directly: pip install aspose_email_foss-26.3-py3-none-any.whl.

Next Steps

Getting Started: Overview and quick-start example
Developer Guide: MSG operations, properties, and attachments