Bounce Types and Categories

The following is a description of the outbound message bounce types and categories reported to Hurricane Server plugins.

Undeliverable Bounces
Category
Description

Hard

Your message encountered an error and was not delivered. Future messages to this recipient will fail. (i.e. user unknown, mailbox not found, etc.)

Soft

Your message encountered an error and was not delivered. Future messages to this recipient may succeed. (i.e. mailbox full, account disabled, exceeds quota, out of disk space, relaying denied)

Blocked Bounces
Category
Description

Challenge

Your message was blocked and further action is necessary to deliver your message. Typically these bounces are sent from spam filters which have quarantined your message, but will deliver it if you follow the instructions in the bounce.

Spam

Your message has been identified as spam and was blocked.

Virus

Your message contained a virus and was blocked.

BlockedOther

Your message was blocked for an unknown or general reason.

Informational Bounces
Category
Description

Transient

Your message encountered an error, but the error condition may be temporary and delivery attempts are still being made. (i.e. unable to connect to recipient's mail server)

Auto-reply

The bounce is an auto-reply. (i.e. out of office, vacation)

Subscribe

The bounce is a subscribe request. (i.e. someone wants to join a mailing list)

Unsubscribe

The bounce is an unsubscribe request. (i.e. someone wants to be taken off of a mailing list)

Address Change

The bounce is an address change notification.

Modified

Your message was modified prior to delivery. (i.e. illegal attachment removed)

Delivered

Your message was delivered. (i.e. delivery status notification reply from recipient's server indicating that your message was delivered)

Custom Bounces
Category
Description

Custom

Reserved for future use

Unknown Bounces
Category
Description

Unknown

The category of the bounce could not be determined.