Understanding Different Email Bounce Codes
A contact gets marked as bounced when an automation email or email campaign gets rejected by their receiving email server. A rejection here means that the email address if not accessible at that time or it is invalid.
Generally, there are two types of bounces tracked:
- Hard Bounces
- Soft Bounces
A Hard bounce means a permanent rejection or failure. When a hard bounce is received, we immediately mark the contact as “Bounced” and that contact no longer receives any automation or campaign email from us.
A Soft bounce means a temporary rejection of failure.
A number of factors lead to a soft bounce; some of these are:
- Overloaded server
- The recipient has a full mailbox
- Big message size
- The server is down or not available
After a contact soft bounces, we do not mark it as bounced immediately; instead, we mark it as “ bounced” after it happens three times in three separate campaigns. After this, the contact no longer receives messages from you.
In your campaign and automation email report, we mention the details of contact bounces such as the bounce code, date of the bounce, type of bounce and its description.
[lore_alert_message type=”info”]Note: We do not mention bounce codes explicitly on your report page. If you want to know the bounce code, you will need to connect with the customer support team to get the same. Bounce codes are the ones that our servers get from the mail servers of the recipients. However, it is possible that these codes do not always reflect the true nature of the bounce.
[/lore_alert_message/]Refer: Techniques to prevent bounce rates inside Aritic PinPoint
Below mentioned is a list of bounce codes that we support and use:
| Bounce Type | Bounce Code [Hidden] | Description |
| Soft | 4.2.2 | The email account is over quota |
| Hard | 5.0.0 | Address does not exist |
| Hard | 5.1.0 | Other address status |
| Hard | 5.1.1 | Bad destination mailbox address |
| Hard | 5.1.2 | Bad destination system address |
| Hard | 5.1.3 | Bad destination mailbox address syntax |
| Hard | 5.1.4 | Destination mailbox address ambiguous |
| Hard | 5.1.5 | Destination mailbox address valid |
| Hard | 5.1.6 | Mailbox has moved |
| Hard | 5.1.7 | Bad sender\’s mailbox address syntax |
| Hard | 5.1.8 | Bad sender’s system address |
| Soft | 5.2.0 | Other or undefined mailbox status |
| Soft | 5.2.1 | Mailbox disabled, not accepting messages |
| Soft | 5.2.2 | Mailbox full |
| Hard | 5.2.3 | Message length exceeds administrative limit. |
| Hard | 5.2.4 | Mailing list expansion problem |
| Hard | 5.3.0 | Other or undefined mail system status |
| Soft | 5.3.1 | Mail system full |
| Hard | 5.3.2 | System not accepting network messages |
| Hard | 5.3.3 | System not capable of selected features |
| Hard | 5.3.4 | Message too big for system |
| Hard | 5.4.0 | Other or undefined network or routing status |
| Hard | 5.4.1 | No answer from host |
| Hard | 5.4.2 | Bad connection |
| Hard | 5.4.3 | Routing server failure |
| Hard | 5.4.4 | Unable to route |
| Soft | 5.4.5 | Network congestion |
| Hard | 5.4.6 | Routing loop detected |
| Hard | 5.4.7 | Delivery time expired |
| Hard | 5.5.0 | Other or undefined protocol status |
| Hard | 5.5.1 | Invalid command |
| Hard | 5.5.2 | Syntax error |
| Soft | 5.5.3 | Too many recipients |
| Hard | 5.5.4 | Invalid command arguments |
| Hard | 5.5.5 | Wrong protocol version |
| Hard | 5.6.0 | Other or undefined media error |
| Hard | 5.6.1 | Media not supported |
| Hard | 5.6.2 | Conversion required and prohibited |
| Hard | 5.6.3 | Conversion required but not supported |
| Hard | 5.6.4 | Conversion with loss performed |
| Hard | 5.6.5 | Conversion failed |
| Hard | 5.7.0 | Other or undefined security status |
| Hard | 5.7.1 | Delivery not authorized, message refused |
| Hard | 5.7.2 | Mailing list expansion restricted |
| Hard | 5.7.3 | Security conversion required but not possible |
| Hard | 5.7.4 | Security features not supported |
| Hard | 5.7.5 | Cryptographic failure |
| Hard | 5.7.6 | Cryptographic algorithm not supported |
| Hard | 5.7.7 | Message integrity failure |
| Hard | 9.1.1 | 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). |
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