CSDN的blog实在是太“稳定”了，经常上不去。没办法，贴这里一个，谁让自己经常需要查呢。
refers:http://www.imarc.net/support/topics/bounce_codes
When you send email to a number of recipients with our broadcast email tool, sometimes your messages bounce back to you. Unfortunately there are only three digit codes as to why this happened.
Below is a complete list of bounce codes, the type of bounce that happened and what the code means.
Hard bounces are generally system errors.
Soft bounces are generally temporary issues.
| Code | Type | Explanation |
|---|---|---|
| 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. |
| 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. |
| Code | Type | Explanation |
|---|---|---|
| 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. |
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