Explaining error and bounce codes in PowerMTA

by CSE Team
19 December 2019
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We detail the classification of PowerMTA Error Codes:

1 Undetermined The response text could not be identified. Undetermined

10 Invalid Recipient The recipient is invalid. Hard

20 Soft Bounce The message soft bounced. Soft

21 DNS Failure The message bounced due to a DNS failure. Soft

22 Mailbox Full The message bounced due to the remote mailbox being over quota. Soft

23 Too Large The message bounced because it was too large for the recipient. Soft

24 Timeout The message timed out. Soft

25 Admin Failure The message was failed by PowerMTA’s configured policies. Admin

30 Generic Bounce: No RCPT No recipient could be determined for the message. Hard

40 Generic Bounce The message failed for unspecified reasons. Soft

50 Mail Block The message was blocked by the receiver. Block

51 Spam Block The message was blocked by the receiver as coming from a known spam source. Block

52 Spam Content The message was blocked by the receiver as spam. Block

53 Prohibited Attachment The message was blocked by the receiver because it contained an attachment. Block

54 Relaying Denied The message was blocked by the receiver because relaying is not allowed. Block

60 Auto-Reply The message is an auto-reply/vacation mail. Soft

70 Transient Failure Message transmission has been temporarily delayed. Soft

80 Subscribe The message is a subscribe request. Admin

90 Unsubscribe The message is an unsubscribe request. Hard

100 Challenge-Response The message is a challenge-response probe. Soft

Note that soft, block and undetermined are usually temporary events. If you’d like to filter on suppression-level events, only check for hard or admin bounce-type events.

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