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Mailgun Email dropped due to suppression list

The recipient's email address is on Mailgun's suppression list.

Understanding Mailgun: An Overview

Mailgun is a powerful email communication API provider that allows developers to send, receive, and track emails effortlessly. It is widely used in production applications for its robust features and ease of integration. Mailgun helps businesses manage their email communications effectively, ensuring high deliverability and providing detailed analytics.

Identifying the Symptom: Email Dropped

One common issue that developers encounter when using Mailgun is the 'Email dropped due to suppression list' error. This symptom is observed when an email fails to reach its intended recipient, and Mailgun logs indicate that the email was dropped.

Exploring the Issue: Suppression List

The suppression list in Mailgun is a feature designed to prevent emails from being sent to addresses that have previously resulted in hard bounces, complaints, or unsubscribes. When an email address is on this list, any attempt to send an email to it will result in the email being dropped. This is a protective measure to maintain sender reputation and avoid unnecessary bounces.

Understanding Suppression Types

Mailgun categorizes suppressions into three types: bounces, complaints, and unsubscribes. Each type has specific criteria for adding an email address to the suppression list. More details can be found in the Mailgun Suppression Documentation.

Steps to Resolve the Issue

To resolve the 'Email dropped due to suppression list' issue, follow these steps:

Step 1: Verify the Suppression List

First, confirm that the recipient's email address is indeed on the suppression list. You can do this by using the Mailgun API or checking through the Mailgun dashboard. Use the following API command to list suppressions:

curl -s --user 'api:YOUR_API_KEY' \
https://api.mailgun.net/v3/YOUR_DOMAIN/suppressions/bounces

Replace YOUR_API_KEY and YOUR_DOMAIN with your actual API key and domain.

Step 2: Remove the Email from the Suppression List

If the email address is on the list and you have verified that it is appropriate to remove it, you can do so using the following API command:

curl -s --user 'api:YOUR_API_KEY' \
-X DELETE \
https://api.mailgun.net/v3/YOUR_DOMAIN/suppressions/bounces/[email protected]

Ensure you replace [email protected] with the actual email address you wish to remove.

Step 3: Resend the Email

Once the email address has been removed from the suppression list, attempt to resend the email. Monitor the logs to ensure that the email is delivered successfully.

Conclusion

Handling suppression list issues in Mailgun is crucial for maintaining effective email communication. By understanding the suppression list and following the steps to manage it, developers can ensure their emails reach the intended recipients. For more detailed guidance, refer to the Mailgun API Suppressions Documentation.

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