BADCHARSET — BADCHARSET

The IMAP server doesn’t support the character set you asked for in a search. If you’re using Riposte to perform email searches, stick to the UTF-8 charset (or the server default) for queries. In practice, you may not directly control this in Riposte, but ensure any search requests avoid unsupported charsets. No specific API call fixes this; the query itself must be adjusted.