Official mailtrap.io API client

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Project description

Official Mailtrap Python client

This Python package offers integration with the official API for Mailtrap.

Add email sending functionality to your Python application quickly with Mailtrap.

Compatibility with previous releases

Versions of this package up to 1.0.1 were different, unrelated project, that is now maintained as Sendria. To continue using it, see instructions.

Installation

Prerequisites

Python version 3.9+

Install package

pip install mailtrap

Usage

Minimal usage (Transactional sending)

import mailtrap as mt

API_TOKEN = "<YOUR_API_TOKEN>"  # your API key here https://mailtrap.io/api-tokens

client = mt.MailtrapClient(token=API_TOKEN)

# Create mail object
mail = mt.Mail(
    sender=mt.Address(email="sender@example.com", name="John Smith"),
    to=[mt.Address(email="recipient@example.com")],
    subject="You are awesome!",
    text="Congrats for sending test email with Mailtrap!",
)

client.send(mail)

Sandbox vs Production (easy switching)

Mailtrap lets you test safely in the Email Sandbox and then switch to Production (Sending). Remove the inbox_id field or set it to None. Then, remove the sandbox field or set it to False. You can change the arguments in the code or via another way. Here is an example using environment variables.

Set next environment variables:

MAILTRAP_API_KEY=your_api_token # https://mailtrap.io/api-tokens
MAILTRAP_USE_SANDBOX=true       # true/false toggle
MAILTRAP_INBOX_ID=123456        # Only needed for sandbox

Bootstrap logic:

import os
import mailtrap as mt

API_KEY = os.environ["MAILTRAP_API_KEY"]
IS_SANDBOX = os.environ.get("MAILTRAP_USE_SANDBOX", "true").lower() == "true"
INBOX_ID = os.environ.get("MAILTRAP_INBOX_ID")

client = mt.MailtrapClient(
  token=API_KEY,
  sandbox=IS_SANDBOX,
  inbox_id=INBOX_ID,  # None is ignored for production
)

# Create mail object
mail = mt.Mail(
    sender=mt.Address(email="sender@example.com", name="John Smith"),
    to=[mt.Address(email="recipient@example.com")],
    subject="You are awesome!",
    text="Congrats for sending test email with Mailtrap!",
)

client.send(mail)

Bulk stream example (optional) differs only by setting bulk=True: bulk_client = mt.MailtrapClient(token=API_KEY, bulk=True)

Recommendations:

Use separate API tokens for Production and Sandbox.
Keep initialisation in a single factory object/service so that switching is centralised.

Full-featured usage example

import base64
import os
from pathlib import Path

import mailtrap as mt

client = mt.MailtrapClient(token=os.environ["MAILTRAP_API_KEY"])

welcome_image = Path(__file__).parent.joinpath("welcome.png").read_bytes()


mail = mt.Mail(
    sender=mt.Address(email="mailtrap@example.com", name="Mailtrap Test"),
    to=[mt.Address(email="your@email.com", name="Your name")],
    cc=[mt.Address(email="cc@email.com", name="Copy to")],
    bcc=[mt.Address(email="bcc@email.com", name="Hidden Recipient")],
    subject="You are awesome!",
    text="Congrats for sending test email with Mailtrap!",
    html="""
    <!doctype html>
    <html>
      <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      </head>
      <body style="font-family: sans-serif;">
        <div style="display: block; margin: auto; max-width: 600px;" class="main">
          <h1 style="font-size: 18px; font-weight: bold; margin-top: 20px">
            Congrats for sending test email with Mailtrap!
          </h1>
          <p>Inspect it using the tabs you see above and learn how this email can be improved.</p>
          <img alt="Inspect with Tabs" src="cid:welcome.png" style="width: 100%;">
          <p>Now send your email using our fake SMTP server and integration of your choice!</p>
          <p>Good luck! Hope it works.</p>
        </div>
        <!-- Example of invalid for email html/css, will be detected by Mailtrap: -->
        <style>
          .main { background-color: white; }
          a:hover { border-left-width: 1em; min-height: 2em; }
        </style>
      </body>
    </html>
    """,
    category="Test",
    attachments=[
        mt.Attachment(
            content=base64.b64encode(welcome_image),
            filename="welcome.png",
            disposition=mt.Disposition.INLINE,
            mimetype="image/png",
            content_id="welcome.png",
        )
    ],
    headers={"X-MT-Header": "Custom header"},
    custom_variables={"year": 2023},
)

client.send(mail)

Minimal usage of email template

import os
import mailtrap as mt

client = mt.MailtrapClient(token=os.environ["MAILTRAP_API_KEY"])

# create mail object
mail = mt.MailFromTemplate(
    sender=mt.Address(email="mailtrap@example.com", name="Mailtrap Test"),
    to=[mt.Address(email="your@email.com")],
    template_uuid="2f45b0aa-bbed-432f-95e4-e145e1965ba2",
    template_variables={"user_name": "John Doe"},
)

client.send(mail)

Sending email directly via SendingApi

This approach is newer. It can be useful when you expect the response to be model-based rather than dictionary-based, as in MailtrapClient.send().

import os
import mailtrap as mt

client = mt.MailtrapClient(token=os.environ["MAILTRAP_API_KEY"])
sending_api = client.sending_api

# create mail object
mail = mt.Mail(
    sender=mt.Address(email="sender@example.com", name="John Smith"),
    to=[mt.Address(email="recipient@example.com")],
    subject="You are awesome!",
    text="Congrats for sending test email with Mailtrap!",
)

sending_api.send(mail)

Mailtrap sending responses difference

1. `client.send()`

Response:

{
  "success": True,
  "message_ids": ["5162954175"]
}

2. `client.sending_api.send()`

Response:

SendingMailResponse(success=True, message_ids=["5162955057"])

The same situation applies to both client.batch_send() and client.sending_api.batch_send().

Supported functionality & Examples

Email API:

Send an email (Transactional and Bulk streams) – sending/minimal_sending.py
Send an email with a template (Transactional and Bulk streams) – sending/sending_with_template.py
Send a batch of emails (Transactional and Bulk streams) – sending/batch_minimal_sending.py
Send a batch of emails with a template (Transactional and Bulk streams) – sending/batch_sending_with_template.py
Advanced sending – sending/advanced_sending.py
Advanced batch sending – sending/batch_advanced_sending.py

Email Sandbox (Testing) API:

Attachments management – testing/attachments.py
Inboxes management – testing/inboxes.py
Messages management – testing/messages.py
Projects management – testing/projects.py

Suppressions API:

Suppressions (find & delete) – suppressions/suppressions.py

Stats API:

Sending stats – stats/stats.py

Email Logs API:

List email logs (with filters & pagination) and get message by ID – email_logs/email_logs.py

General API:

Account Accesses management – general/account_accesses.py
Accounts info – general/accounts.py
Billing info – general/billing.py
Permissions listing – general/permissions.py

Contributing

Bug reports and pull requests are welcome on GitHub. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

Development Environment

Clone the repo

git clone https://github.com/mailtrap/mailtrap-python.git
cd mailtrap-python

Install tox

tox is an environment orchestrator. We use it to setup local environments, run tests and execute linters.

python -m pip install --user tox
python -m tox --help

To setup virtual environments, run tests and linters use:

tox

It will create virtual environments with all installed dependencies for each available python interpreter (starting from python3.9) on your machine. By default, they will be available in {project}/.tox/ directory. So, for instance, to activate python3.11 environment, run the following:

source .tox/py311/bin/activate

Information for version 1 users

If you are a version 1 user, it is advised that you upgrade to Sendria, which is the same package, but under a new name, and with new features. However, you can also continue using the last v1 release by locking the version in pip:

# To use the FORMER version of the mailtrap package, now known as Sendria:
pip install --force-reinstall -v "mailtrap==1.0.1"

License

The project is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Mailtrap project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct

Project details

These details have not been verified by PyPI

Project links

Release history Release notifications | RSS feed

This version

2.5.0

Mar 31, 2026

2.4.0

Dec 4, 2025

2.3.0

Oct 24, 2025

2.2.0

Sep 18, 2025

2.1.0

May 13, 2025

2.0.1

May 18, 2023

2.0.0

Mar 11, 2023

1.0.1

Oct 3, 2020

1.0.0 yanked

Aug 20, 2020

Reason this release was yanked: