| Bounce code | Bounce type | Description |
|
5.0.0
|
Hard
|
Address does not exist
|
|
5.1.0
|
Hard
|
Other address status
|
|
5.1.1
|
Hard
|
Bad destination mailbox address
|
|
5.1.2
|
Hard
|
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 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
|
System not accepting network messages
|
|
5.3.3
|
Hard
|
System not capable of selected features
|
|
5.3.4
|
Hard
|
Message too big for system
|
|
5.4.0
|
Hard
|
Other or undefined network or routing status
|
|
5.4.1
|
Hard
|
No answer from 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
|
Conversion required and prohibited
|
|
5.6.3
|
Hard
|
Conversion required but not supported
|
|
5.6.4
|
Hard
|
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
|
Cryptographic algorithm not supported
|
|
5.7.7
|
Hard
|
Message integrity failure
|
|
9.1.1
|
Hard
|
Hard bounce with no bounce code found. It could be an invalid email or rejected email from your mail server (such as from a sending limit).
|