problems registration new users - site not sending a letter

After registration new user, sending a letter for him is failed. I use snippet "Login" .
In error.log :

[2015-08-25 02:41:34] (ERROR @ /connectors/index.php) Could not get table class for class: modAccess
[2015-08-25 02:41:34] (ERROR @ /connectors/index.php) Could not get table name for class: modAccess
[2015-08-25 02:41:34] (ERROR @ /connectors/index.php) Error 42000 executing statement:
Array
(
[0] => 42000
[1] => 1064
[2] => You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AS `modAccess` WHERE `modAccess`.`principal` = 19' at line 1

I use MODX Revolution 2.3.3-pl (traditional)

MySQL
server: Localhost via UNIX socket
version of server: 5.5.44-0+deb7u1-log
Protocol version: 10
MySQL Charset: UTF-8 Unicode (utf8)
Web server
Apache
MySQL client version: mysqlnd 5.0.8-dev - 20102224 - $Id: 731e5b87ba42146a687c29995d2dfd8b4e40b325 $
PHP extension: mysqli
phpMyAdmin
Version information: 3.4.11.1deb2+deb7u1

I'm not sure how you're using the login snippet, but generally, you use the Register snippet (included in the Login package) to register users and send an email.

You might also try the QuickEmail snippet to make sure the mail system is working on your host.