Riposte solution
The server supports the METADATA extension (for storing custom metadata on mailboxes). This is an informational capability notification. Unless your application plans to use METADATA commands, you don't need to do anything. Riposte doesn't use this for core functionality, so you can ignore it.
Quick facts
- Provider
- IMAP
- Endpoint / surface
- IMAP Protocol
Why it happens
[Protocol-level condition per RFC/extension]
How to fix it
[Adjust client behavior per RFC semantics; often retry or change command/parameters]