SendMessageRequest

public SendMessageRequest SendMessageRequest(    @Json(name = "to") List<EmailName> to,     @Json(name = "from") List<EmailName> from,     @Json(name = "bcc") List<EmailName> bcc,     @Json(name = "cc") List<EmailName> cc,     @Json(name = "reply_to") List<EmailName> replyTo,     @Json(name = "attachments") List<CreateAttachmentRequest> attachments,     @Json(name = "subject") String subject,     @Json(name = "body") String body,     @Json(name = "starred") Boolean starred,     @Json(name = "send_at") Integer sendAt,     @Json(name = "reply_to_message_id") String replyToMessageId,     @Json(name = "tracking_options") TrackingOptions trackingOptions,     @Json(name = "use_draft") Boolean useDraft,     @Json(name = "custom_headers") List<CustomHeader> customHeaders)