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BounceStudio™ API - Email Bounce Return Codes

Return CodeDescription
0UNDETERMINED - (ie. Recipient Reply)
10HARD BOUNCE - (ie. User Unknown)
20SOFT BOUNCE - General
21SOFT BOUNCE - Dns Failure
22SOFT BOUNCE - Mailbox Full
23SOFT BOUNCE - Message Too Large
30BOUNCE - NO EMAIL ADDRESS. VERY RARE!
40GENERAL BOUNCE
50MAIL BLOCK - General
51MAIL BLOCK - Known Spammer
52MAIL BLOCK - Spam Detected
53MAIL BLOCK - Attachment Detected
54MAIL BLOCK - Relay Denied
60AUTO REPLY - (ie. Out Of Office)
70TRANSIENT BOUNCE
80SUBSCRIBE Request
90UNSUBSCRIBE/REMOVE Request
100CHALLENGE-RESPONSE



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"There are hundreds of bounce formats you can encounter on the Net, and the fact that new or obscure bounces can be caught simply and painlessly with BounceStudio saves us valuable development time."


John Gowland, CEO
Cyberlogtech
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