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The bounce classification codes are identical for all versions of Momentum. Find below a list of these codes and their meanings.

1The response text could not be identified. (Undetermined)
10The recipient is invalid. (Invalid Recipient)
20The message soft bounced. (Soft Bounce)
21The message bounced due to a DNS failure. (DNS Failure)
22The message bounced due to the remote mailbox being over quota. (Mailbox Full)
23The message bounced because it was too large for the recipient. (Too Large)
24The message timed out. (Timeout)
25The message was failed by Momentum's configured policies. (Admin Failure)
30No recipient could be determined for the message. (Generic Bounce: No RCPT)
40The message failed for unspecified reasons. (Generic Bounce)
50The message was blocked by the receiver. (Mail Block)
51The message was blocked by the receiver as coming from a known spam source. (Spam Block)
52The message was blocked by the receiver as spam (Spam Content)
53The message was blocked by the receiver because it contained an attachment (Prohibited Attachment)
54The message was blocked by the receiver because relaying is not allowed. (Relay Denied)
60The message is an auto-reply/vacation mail. (Auto-Reply)
70Message transmission has been temporarily delayed. (Transient Failure)
80The message is a subscribe request. (Subscribe)
90The message is an unsubscribe request. (Unsubscribe)
100The message is a challenge-response probe. (Challenge-Response)
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