CuseTheJuice Mailbox Create Dovecot Folder

Use this endpoint when you need to programmatically create a new IMAP/Maildir folder inside a CuseTheJuice mailbox — for example, to set up organizational folders like Newsletters, Work, or Archives before routing messages into them. Prefer this over delete or move endpoints when the goal is folder provisioning rather than message management.

• Invalid credentials (wrong email, username, or password) — authentication failure
• Folder name already exists — duplicate folder conflict
• Attempting to create a reserved system folder name — rejected
• Malformed email format — validation error
• Missing required fields (email, password, username, folder_name) — 400 bad request
• Payment failure via x402 — 402 payment required or insufficient funds
• Folder name contains invalid characters for Maildir — rejected