FAQs in this section
What is a bounce message and error code?
What are different bounce categories?
What are the different error codes?
What are the different traditional 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?

What are the different enhanced bounce codes?

Here are some enhanced bounce codes:
 
Code  Type  Explanation
4.2.2 Soft The email account is over quota
5.0.0 Hard The address does not exist
5.1.0 Hard Another address status
5.1.1 Hard A bad destination mailbox address
5.1.2 Hard A bad destination system address
5.1.3 Hard Bad destination mailbox address syntax
5.1.4 Hard Destination mailbox address ambiguous
5.1.5 Hard Destination mailbox address valid
5.1.6 Hard Mailbox has moved
5.1.7 Hard Bad sender’s mailbox address syntax
5.1.8 Hard Bad sender’s system address
5.2.0 Soft Other or undefined mailbox status
5.2.1 Soft Mailbox disabled, not accepting messages
5.2.2 Soft Mailbox full
5.2.3 Hard Message length exceeds the administrative limit
5.2.4 Hard Mailing list expansion problem
5.3.0 Hard Other or undefined mail system status
5.3.1 Soft Mail system full
5.3.2 Hard The system is not accepting network messages
5.3.3 Hard The system is not capable of selected features
5.3.4 Hard Message too big for the system
5.4.0 Hard Other or undefined network or routing status
5.4.1 Hard No answer from the host
5.4.2 Hard Bad connection
5.4.3 Hard Routing server failure
5.4.4 Hard Unable to route
5.4.5 Soft Network congestion
5.4.6 Hard Routing loop detected
5.4.7 Hard Delivery time expired
5.5.0 Hard Other or undefined protocol status
5.5.1 Hard Invalid command
5.5.2 Hard Syntax error
5.5.3 Soft Too many recipients
5.5.4 Hard Invalid command arguments
5.5.5 Hard Wrong protocol version
5.6.0 Hard Other or undefined media error
5.6.1 Hard Media not supported
5.6.2 Hard The conversion required and prohibited
5.6.3 Hard A conversion required but not supported
5.6.4 Hard A conversion with loss performed
5.6.5 Hard Conversion failed
5.7.0 Hard Other or undefined security status
5.7.1 Hard Delivery not authorized, message refused
5.7.2 Hard Mailing list expansion prohibited
5.7.3 Hard Security conversion required but not possible
5.7.4 Hard Security features not supported
5.7.5 Hard Cryptographic failure
5.7.6 Hard The cryptographic algorithm not supported
5.7.7 Hard Message integrity failure
9.1.1 Hard Hard bounce with no bounce code found (invalid email or rejected email from your mail server such as -  sending limit)

To know more about Email Bounces and Error Codes, click here.
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