When a customer triggers a blocklisting on Marketo's shared IP range that customer is moved to a set of IPs we call the quarantined IP range. We do this to protect the health of our shared network and ensure the best deliverability possible for all of our customers on that network.
If you have received a Blocklist Notification from Marketo reporting that you have triggered a blocklisting your Marketo account is now in the quarantined IP range.
While you are in the quarantined range it is possible that you may experience a slight decrease in your deliverability rates. The reason for this is that you are now sending from a range made up of senders that have also caused other blocklist issues. All customers have received a notice of the listing and are in the process of repairing their database.
There are two ways to be removed from the quarantined IP range:
- Follow the steps outlined in our Blocklist Remediation article. Be sure to fill out the form referenced in the email alert to indicate that you have taken steps to mitigate the issue.
- Demonstrate clean sending behavior for 3 months. We remove senders from the quarantined IP range if they have not triggered any new listings in 3 months.
To ensure your best deliverability rates blocklist issues should be addressed right away to prevent further damage to your sending reputation. Furthermore, if no action is taken to improve list hygiene the issue will likely recur. Marketo's Delivery and Compliance Team strongly recommend following the Blocklist Remediation steps.
Additional Resources:
Blocklist Deep Dive
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