Email notification not working Opencart 2.0.2

I'm NOT receiving email notification, New account alert mail, New costumer alert mail. Please help.
Open Cart Version 2.0.2

I got mails from Contact us page so I'm sure I did the SMTP configuration right.

I got these messages:

2015-05-13 0:15:12 - PHP Warning: fsockopen(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/yhcparts/public_html/system/library/mail.php on line 170
2015-05-13 0:15:12 - PHP Warning: fsockopen(): unable to connect to :587 (php_network_getaddresses: getaddrinfo failed: Name or service not known) in /home/yhcparts/public_html/system/library/mail.php on line 170
2015-05-13 0:15:12 - PHP Notice: Error: php_network_getaddresses: getaddrinfo failed: Name or service not known (0) in /home/yhcparts/public_html/system/library/mail.php on line 173

My Lines in mail.php

Line 170: $handle = fsockopen($hostname, $this->smtp_port, $errno, $errstr, $this->smtp_timeout);
Line 173: trigger_error('Error: ' . $errstr . ' (' . $errno . ')');