curl: Cross-protocol redirect to imap:// or smtp:// uploads the -F/MIMEPOST form and the custom Authorization/Cookie headers to the redirect target

Summary: When a transfer that posts a multipart form CURLOPTMIMEPOST, the tool's -F follows a redirect to an imap:// URL, curl APPENDs the whole form to the mailbox on the redirect target and puts the application's CURLOPTHTTPHEADER list into the mail headers, including custom Authorization: and...