Real Time Blocklist Delisting
In some rare cases, you may need to reach out to Mailgun support to remove our IP addresses from a Real-time Blocklist (RBL). This workflow will cover how to verify and resolve these issues.
Check for Suppression in Mailgun
Verify the RBL listing
In the logs, if you see a mention of a rejection due to abuse or explicit confirmation of a blocklist, proceed to the link and look up the IP address. Every provider will be different, but if a lookup database is available, you should verify that it is listed and if a reason is stated.
You can confirm that the IP address is ours by doing a “host” lookup on the IP address. It should always end in
Open a Ticket With Mailgun
Navigate to Mailgun > Support and click “Create Ticket”. Be sure to include:
- The IP Address that is blocklisted
- The name of the RBL and link to it (Found in the Message returned by the mail server)
- Copy of the Logs
Be sure to follow up with the customer and let them know that we’ve requested support through Mailgun. They should return a response within 24 hours. If we are blocklisted due to a specific account, please check in with Site Reliability Engineers in #production.