This article covers email delivery failures caused by suppression lists in message delivery, including how suppression lists work and steps to resolve a blocked delivery.
💡 Quick answers
- Why was the email blocked? The recipient's address is in a suppression list, which automatically prevents further delivery.
- What causes an address to be added to a suppression list? A prior hard bounce, spam complaint, or unsubscribe event triggers automatic suppression.
- Can the suppression be lifted? Yes. Contact Finalsite Support with the affected email address to request a suppression review.
- Should the message be re-sent in the meantime? No. Do not re-send to a suppressed address until the suppression has been reviewed and lifted.
In this article
Understanding the error
When a message cannot be delivered and the bounce log shows the error code smtp;550 5.7.1 recipient is in suppression list "badpatternslist01", the recipient's email address is on a suppression list. Suppressed addresses are blocked from receiving any further messages until the suppression is reviewed and lifted by an administrator.
What causes suppression
Email addresses are added to suppression lists automatically when one of the following events occurs:
- A hard bounce: the address does not exist, has been deactivated, or cannot receive mail
- A spam complaint: the recipient marked a previous message as spam
- An unsubscribe event: the recipient opted out of communications
Suppression is a safeguard that protects sender reputation and helps maintain healthy deliverability for all outgoing messages.
Resolve a suppression list block
Confirm the error before acting
Review the bounce or delivery log in Finalsite Messages to verify that the error code smtp;550 5.7.1 recipient is in suppression list "badpatternslist01" is present. Note the full email address of the affected recipient. For guidance on reviewing delivery issues in Messages, see Troubleshoot recipients who are not receiving communications in Messages.
Stop any re-send attempts
Do not re-send to the suppressed address before the suppression is resolved. Additional send attempts to a suppressed address will continue to fail and will not clear the block.
Contact Finalsite Support to request a review
Only Finalsite Support can review and lift a suppression. Reach out with the affected email address and a description of the situation. Support will investigate the reason for suppression and advise on whether the address can be reinstated.
Before contacting Support, it is helpful to confirm with the recipient that the email address is valid and actively in use, and to check whether the address may have bounced or been flagged in the past. Following best practices for sending emails with Messages can help reduce future suppression events.
Contact Finalsite Support
To request a suppression review, contact Finalsite Support and provide the following:
- The affected recipient's email address
- The name of the communication or campaign in which the block occurred
- Any relevant context, such as whether the recipient recently unsubscribed or reported a bounce
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