[
    {
        "name": "email_account_id",
        "type": "select",
        "label": "From mailbox",
        "required": true,
        "options": "rpc://mailboxList"
    },
    {
        "name": "to",
        "type": "array",
        "label": "To",
        "required": true,
        "spec": { "type": "email" }
    },
    { "name": "subject", "type": "text", "label": "Subject", "required": true },
    { "name": "body_html", "type": "text", "label": "HTML body" },
    { "name": "body_plain", "type": "text", "label": "Plain-text body" },
    {
        "name": "cc",
        "type": "array",
        "label": "CC",
        "spec": { "type": "email" }
    },
    {
        "name": "bcc",
        "type": "array",
        "label": "BCC",
        "spec": { "type": "email" }
    },
    {
        "name": "thread_id",
        "type": "text",
        "label": "Thread ID",
        "help": "Thread to attach the reply to (from a New Email Received trigger)."
    },
    {
        "name": "in_reply_to",
        "type": "array",
        "label": "In reply to (message IDs)",
        "spec": { "type": "text" }
    },
    {
        "name": "send_mode",
        "type": "select",
        "label": "Send mode",
        "default": "instant",
        "options": [
            { "label": "Instant", "value": "instant" },
            { "label": "Smart", "value": "smart" },
            { "label": "Scheduled", "value": "scheduled" }
        ]
    },
    { "name": "scheduled_at", "type": "date", "label": "Scheduled at" }
]