Mailbox::registerMessage

protected function registerMessage(&$fields, $replaces = null, $isOutgoing = false)
{
	$now = new MainTypeDateTime();

	if (!empty($replaces))
	{
		/*
			To replace the temporary id of outgoing emails with a permanent one
			after receiving the uid from the original mail service.
		*/
		if($isOutgoing)
		{
			if (!is_array($replaces))
			{
				$replaces = [
					'=ID' => $replaces,
				];
			}

			$exists = MailMailMessageUidTable::getList([
				'select' => [
					'ID',
					'MESSAGE_ID',
				],
				'filter' => [
					$replaces,
					'=MAILBOX_ID' => $this->mailbox['ID'],
					'==DELETE_TIME' => 0,
				],
			])->fetch();
		}
		else
		{
			$exists = [
				'ID' => $replaces,
				'MESSAGE_ID' => $fields['MESSAGE_ID'],
			];
		}
	}

	if (!empty($exists))
	{
		$fields['MESSAGE_ID'] = $exists['MESSAGE_ID'];

		$result = (bool) MailMailMessageUidTable::updateList(
			array(
				'=ID' => $exists['ID'],
				'=MAILBOX_ID' => $this->mailbox['ID'],
				'==DELETE_TIME' => 0,
			),
			array_merge(
				$fields,
				array(
					'TIMESTAMP_X' => $now,
				)
			),
			array_merge(
				$exists,
				array(
					'MAILBOX_USER_ID' => $this->mailbox['USER_ID'],
				)
			)
		);
	}
	else
	{
		$checkResult = new ORMDataAddResult();
		$addFields = array_merge(
			[
				'MESSAGE_ID'  => 0,
			],
			$fields,
			[
				'IS_OLD' => 'D',
				'MAILBOX_ID'  => $this->mailbox['ID'],
				'SESSION_ID'  => $this->session,
				'TIMESTAMP_X' => $now,
				'DATE_INSERT' => $now,
			]
		);

		MailMailMessageUidTable::checkFields($checkResult, null, $addFields);
		if (!$checkResult->isSuccess())
		{
			return false;
		}

		MailMailMessageUidTable::mergeData($addFields, [
			'MSG_UID' => $addFields['MSG_UID'],
			'HEADER_MD5' => $addFields['HEADER_MD5'],
			'SESSION_ID' => $addFields['SESSION_ID'],
			'TIMESTAMP_X' => $addFields['TIMESTAMP_X'],
		]);

		return true;
	}

	return $result;
}