550 5.2.0: Other Mailbox Status
The 550 5.2.0 error is a generic mailbox-level rejection. Learn what this SMTP bounce means, what causes it, and how to resolve it.
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550
5.2.0
Other Mailbox Status
Common
🔢 Enhanced Status Code Breakdown: 5.2.0
| Component | Value | Meaning |
|---|---|---|
| Class | 5 | Permanent failure (Hard bounce) |
| Subject | 2 | Mailbox status |
| Detail | 0 | Other Mailbox Status |
Per RFC 3463 Enhanced Mail System Status Codes. Class (X) = severity, Subject (Y) = category, Detail (Z) = specific condition.
💬 What This Error Means
Something is wrong with the recipient's mailbox, but the server didn't give a specific reason. This is a generic 'mailbox error' that can mean anything from a temporary glitch to a settings problem on their end.
Common Causes
- A temporary problem with the recipient's mail server
- The person's inbox has a specific rule that blocked your message
- The mailbox is in the middle of a migration or update
How to Fix This
- Try sending your message again in a few hours
- If it keeps happening, you might need to reach out to the person through another channel
📚 Official Documentation
📋 Real-World Example Messages
These are real bounce message formats you might receive. Paste yours into the Bounce Decoder for instant analysis.
550 5.2.0 Other or undefined mailbox status
🔗 Related Error Codes
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