When a subscriber marks an email as spam, ESPs (Email Service Providers) take several actions primarily focused on protecting both the recipient and the sender's reputation. The core mechanism involves using feedback loops (FBLs) with ISPs to receive notifications of spam complaints. Upon receiving a complaint, ESPs typically unsubscribe the recipient from future mailings or add them to a suppression list, which prevents any further emails from being sent to that address. This action is documented in the customer's record. Legitimate ESPs always stop mailing users who mark emails as spam, although the specific method (special flag, unsubscribe, or suppression list) may vary. Ignoring spam complaints is not an option. Maintaining good list hygiene and actively managing complaints are crucial for improving email deliverability and preventing negative impacts on sender scores. Proper data management by brands is also important. Some ESPs provide tools for senders to monitor complaint rates and recommend a re-engagement campaign.

When a subscriber marks an email as spam, ESPs (Email Service Providers) take several actions to protect both the recipient and the sender's reputation. They use feedback loops with ISPs to receive notifications of spam complaints. Upon receiving a complaint, the ESP typically unsubscribes the recipient from future mailings or adds them to a suppression list. This helps maintain good sender reputation, improves deliverability metrics, and ensures compliance with ISP requirements. Some ESPs provide tools for senders to monitor complaint rates. Actively managing spam complaints is crucial for improving email deliverability and preventing negative impacts on sender scores.

When a subscriber marks an email as spam, ESPs take action to prevent future emails and maintain sender reputation. Standard practices include adding the user to a suppression list, unsubscribing them, or flagging them in the system. Feedback loops are used to receive spam complaints from mailbox providers. List hygiene is crucial for managing spam complaints, as responsible ESPs automatically suppress users who mark emails as spam. It is important to document these actions. Failure to manage data and being overly aggressive with Feedback Loops (FBLs) can create issues.

ESPs like Mailchimp, SendGrid, Amazon SES, and SparkPost utilize feedback loops (FBLs) to manage spam complaints. When a subscriber marks an email as spam, the ESP receives a notification from the ISP. The ESP then automatically unsubscribes the recipient or adds them to a suppression list to prevent future mailings. This process helps maintain the sender's reputation and ensures compliance with ISP policies.