Mail::prepareMessageOptions

protected function prepareMessageOptions(): array
{
	return [
		'ATTACHMENTS_STORAGE_TYPE_ID' => $this->storageTypeId,
		'ATTACHMENTS_IDS' => array_unique($this->attachmentIds),
		'MESSAGE_SUBJECT' => $this->messageSubject,
		'MESSAGE_BODY' => $this->messageBody,
		'MESSAGE_BODY_CONTENT_TYPE' => $this->messageBodyContentType,
		'MESSAGE_FROM' => $this->getFrom()->getName(),
		'MAILBOX_ID' => $this->getFrom()->getId(),
	];
}