I use SparkPost to distribute a newsletter by email for an organization I support. A member of the organization reported to me that she has not been receiving email copies of the organization's newsletter, so I logged into the SparkPost account after this month's newsletter was sent and clicked on Events on the Dashboard, selected "Last 7 Days" in the Events Search date range selection field and then put the member's email address in the "Filter by recipient email address" field and hit Enter. I saw an "Injection" and a "Bounce" event whereas I would see an "Injection" and a "Delivery" event for email successfully sent to a recipient. When I clicked on the View Details button, I found that the email sent to the member bounced with SparkPost listing the reason as "554 5.7.1 [internal] recipient address was suppressed due to customer policy." At the SparkPost page on the problem, 554 5.7.1 — Recipient address was suppressed due to customer policy, I saw the possible reasons for that bounce message appear listed as those below:
- The address was invalid (address does not exist)
- The user clicked the list-unsubscribe header
- The user clicked one of your emails and flagged it as SPAM. This FBL (FeedBack Loop) event should add that email address to your Suppression List.
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