Overview

Mailgun is a powerful tool for sending emails, but sometimes users may encounter delivery issues. One common problem is when messages are logged as 'accepted' but take an unusually long time to be delivered, or fail to deliver altogether. This article will help you troubleshoot this issue.

Problem Description

If you are experiencing delays in email delivery or messages that remain in the 'accepted' state, it could be related to the parameters you are passing to the Mailgun API. This issue can occur across various recipient domains and at different times, indicating that it may not be isolated to a specific configuration.

Example Log Entry

To illustrate the problem, here’s an example of a JSON log entry for a message that encountered delivery issues:

{
    "tags": [], 
    "timestamp": 1411498829.247304, 
    "envelope": {
        "targets": "my-own-email@address.com", 
        "transport": "", 
        "sender": "noreply@the-site-in-question.com"
    }, 
    "recipient-domain": "address.com", 
    "event": "accepted", 
    "campaigns": [], 
    "user-variables": {}, 
    "flags": {
        "is-authenticated": true, 
        "is-system-test": false, 
        "is-test-mode": false
    }, 
    "message": {
        "headers": {
            "to": "my-own-email@address.com", 
            "message-id": "20140923190027.112157.29352@the-site-in-question.com", 
            "from": "\"the-site-in-question.com\" <noreply@the-site-in-question.com>", 
            "subject": "Dom, your password was reset."
        }, 
        "attachments": [], 
        "recipients": [
            "my-own-email@address.com"
        ], 
        "size": 556
    }, 
    "recipient": "my-own-email@address.com", 
    "method": "http"
}

Suggested Solutions

  1. Check API Parameters: Review the parameters you are sending to the Mailgun API. Ensure that the email addresses are correctly formatted and that all required fields are included.
  2. Monitor Delivery Events: Use Mailgun's event tracking to monitor the status of your emails. This can provide insights into whether messages are being processed correctly.
  3. Consult Mailgun Support: If the issue persists, consider reaching out to Mailgun support for assistance. They can provide more detailed insights based on your account activity.

Conclusion

By following these troubleshooting steps, you should be able to identify and resolve issues related to email delivery with Mailgun. Always ensure that your API calls are correctly configured to avoid common pitfalls.