Manage Bounce Mail

Bounces in Salesforce Marketing Cloud

A bounce is a message that is returned to the Salesforce Marketing Cloud to explain why an email message cannot be delivered to the subscriber's email address. Following is a list of the types of bounces.

Soft bounce

A soft bounce occurs when the email server rejects the email message due to a seemingly temporary condition, such as:

  • Address is temporarily unavailable due to an inactive or temporarily disabled mailbox
  • Recipient's mailbox is full
  • Temporary domain failure

The Marketing Cloud will make 288 attempts to deliver the email message. If all attempts are unsuccessful, it is considered a soft bounce.

Types of soft bounces include:

  • Block bounce: Occurs when the email server rejects the email message due to filter issues, such as:
    • Complaints
    • Blacklisted IP address
    • Content-related issues
    • URLs within the email message are blocked
    • Improper authentication
  • Technical bounce: Occurs when the email server rejects the email message due to technical errors, such as:
    • The server is too busy/temporarily overwhelmed
    • Formatting or line length errors
    • Network connection lost or timed out

Hard bounce

A hard bounce is an email message that is undeliverable for permanent reasons, such as:

  • Bad/nonexistent domain
  • Invalid or fake email address
  • High number of unknown/inactive addresses on a list

If a subscriber's status changes from "Active" to "Bounced", Marketing Cloud will not attempt to send the email message. Consider removing all hard bounce email addresses from your list.