Send attached file with Mailgun using python

Question

I’m trying to send an email with an attached file with the Mailgun API using requests.post.

In their documentation they alert that you must use multipart/form-data encoding when sending attachments, I’m trying this:

import requests
MAILGUN_URL = 'https://api.mailgun.net/v3/sandbox4f...'
MAILGUN_KEY = 'key-f16f497...'


def mailgun(file_url):
    """Send an email using MailGun"""

    f = open(file_url, 'rb')

    r = requests.post(
        MAILGUN_URL,
        auth=("api", MAILGUN_KEY),
        data={
            "subject": "My subject",
            "from": "[email protected]",
            "to": "[email protected]",
            "text": "The text",
            "html": "The<br>html",
            "attachment": f
        },
        headers={'Content-type': 'multipart/form-data;'},
    )

    f.close()

    return r


mailgun("/tmp/my-file.xlsx")

I’ve defined the header to be sure that the content type is multipart/form-data, but when I run the code, I get a 400 status with reason: Bad Request

What’s wrong? I need be sure that i’m using multipart/form-data and I’m using correctly the attachment parameter

Asked By: maoaiz

||

Source

Answer 1

You need to use the files keyword argument. Here is the documentation in requests.

And an example from the Mailgun documentation:

def send_complex_message():
    return requests.post(
        "https://api.mailgun.net/v3/YOUR_DOMAIN_NAME/messages",
        auth=("api", "YOUR_API_KEY"),
        files=[("attachment", open("files/test.jpg")),
               ("attachment", open("files/test.txt"))],
        data={"from": "Excited User <YOU@YOUR_DOMAIN_NAME>",
              "to": "[email protected]",
              "cc": "[email protected]",
              "bcc": "[email protected]",
              "subject": "Hello",
              "text": "Testing some Mailgun awesomness!",
              "html": "<html>HTML version of the body</html>"})

So modify your POST to:

r = requests.post(
    MAILGUN_URL,
    auth=("api", MAILGUN_KEY),
    files = [("attachment", f)],
    data={
        "subject": "My subject",
        "from": "[email protected]",
        "to": "[email protected]",
        "text": "The text",
        "html": "The<br>html"
    },
)

This should work fine for you.

Answered By: That1Guy

Send attached file with Mailgun using python

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