Soft Bounce

  • Soft Bounce and Hard Bounce Code Lookup and Definitions

    … being sent to again. Sending repeatedly to a hard bounced email address can get your email service provider blacklisted. Soft Bounce and Hard Bounce Code Lookup and Definitions Code Type Description 421 Soft Service not available 450 Soft Mailbox unavailable 451 Soft Error in processing 452 Soft Insufficient system storage 500 Hard Address does…

    Douglas Karr/ Marketing Technology Blog- 7 readers -