SendGrid Suppression Lists

• Suppression List Overview

Supported Suppression Lists

• Global unsubscribes happen when a recipient indicates that they would like to opt out from any email that you send by clicking on the Unsubscribe From All Emails link within your emails.
• Group unsubscribes happen when a recipient indicates that they would like to opt out from a specific type of email that you send via the Unsubscribe Groups link from within your email.
• Bounces occur when a sent message is rejected by the receiving mail server. The most common causes for bounced email messages include a misspelled or nonexistent email address.
• Blocks happen when your message was rejected for a reason related to the message, not the recipient address. This can happen when your mail server IP address has been added to a deny list, blocked by an ISP, or if the message content is flagged by a filter on the receiving server.
• Invalid emails occur when you attempt to send email to an address that is formatted in a manner that does not meet internet email format standards or the email does not exist at the recipient's mail server. Examples include addresses without the “@” sign or addresses that include certain special characters and/or spaces.
• Spam reports are triggered when a customer clicks the spam button while viewing your message, marks the message as spam some other way, or moves your message into the spam folder Spam reports can only be gathered from Internet Service Providers (ISPs) that provide a feedback loop.