SMTP code 4.6.0
What the knowledge base's own tables say about this code, and which articles say it — a description of the reply, never a placement prediction.
No article documents 4.6.0 itself. The lines below come from articles documenting X.6.0, which covers it.
This page shows the class-4 spelling of X.6.0, which is the catch-all for its subject. A leading 4 means a temporary failure, so the message can be retried.
- Meaning
- Other or undefined media error
From SMTP Enhanced Status Codes (RFC 3463) · X.6.X: Message content or media