What is a bounce message and error code? What are different bounce categories? What are the different traditional bounce codes? What are the different enhanced bounce codes? Can I customize the bounce messages? I need a detailed report regarding a bounce message. How can I get it? What is a hard bounce? What is a general bounce? What is a 'DNS failure' error? What is a 'Mailbox full' error? What is a 'Message too large' error? What is a 'Mail block - relay denied' error? What is a 'Mail block - general' error? What is a 'Mail block - spam detected' error? What is a transient bounce? What is a challenge or response bounce? What is a 'Bounce - no email address returned' error?