- Client.SendMail: PUT /api/2.0/mail/messages/send.json, omits empty cc/bcc - oo mails send subcommand with --id/--to/--subject/--body/--cc/--bcc - guard: sending by --id without --body errors (send.json does not copy subject/body from the draft; prevents empty emails) - unit test: empty cc/bcc omitted, correct path