Trouble with MailGun File Attachments: Local vs Production Environments

Other Questions Mailgun
1

I’m encountering an issue where my file attachment works perfectly when testing locally, yet fails to attach on the production deployment. I suspect the difference in environment paths is causing the problem. Here is an updated sample of my email sending function:

import os
import requests

def dispatch_mail(mail_subject, sender_email, recipients_list, content_html, attach_file=None):
    # Determine file path based on environment
    current_env = os.getenv('APP_ENV', 'local')
    if attach_file is not None:
        if current_env == 'local':
            file_path = os.path.abspath(attach_file)
        else:
            file_path = os.path.join('/var/app/', attach_file)
        with open(file_path, 'rb') as file_data:
            attachment = [('file', file_data.read())]
    else:
        attachment = None

    response = requests.post(
        'https://api.mailgun.net/v3/your_domain.com/messages',
        auth=('api', 'YOUR_API_KEY'),
        files=attachment,
        data={
            'from': f'Example App <no-reply@your_domain.com>',
            'to': recipients_list,
            'subject': mail_subject,
            'html': content_html
        }
    )
    return response

Any insights on why the attachment might not be transmitted on live production, despite working locally, would be greatly appreciated. Thank you for your help with this attachment issue.

2

I encountered a similar situation when transitioning my project from local to production. Indeed, differences in environmental file system setups can cause these kinds of issues. I discovered that the production server had a different working directory and permission settings compared to my local machine. By adding logging to confirm the existence and accessibility of the file at runtime, I was able to identify that the file path was not correctly resolved. Adjusting the path resolution process while accommodating production nuances ultimately resolved the file attachment issue.

3

hey, i had this same issue! check that your enviroment path is correct and that file permissons are set right in prod. sometimes a slight misconfig in the path or file access can cause the attachment to fail. hope this helps!

4

During my time working on similar projects, I encountered issues where file attachments failed even though they worked perfectly in a development environment. In my case, the problem turned out to be related to differences in file permissions and path handling in production. I also discovered that minor discrepancies in environment variable configurations can be the culprit. I solved it by ensuring that the file paths were truly absolute and by adding extra error handling to log file access problems on production. This approach clarified misconfigurations that were otherwise hard to track down.