Failed To Send Email From Drupal using SMTP module

User registration email failed to be sent out and warning displayed in the following settings:

1. opennssl is active because options appear in the settings page
2. SMTP server : smtp.gmail.com
3. SMTP port: 465 or 587 (both tried)
4. Use encrypted protocol: SSL and TLS (both tried)
7. Drupal5 with windows and PHP version 5.1.6
8. In admin/settings/site-information the auto-mailer email is set to my gmail account (@gmail.com )
5. SMTP username: my gmail account (@gmail.com included)
6. SMTP password: my gmail account password
9. Tried to enter new user using another gmail account but no email was sent out. Rather the following warning displayed.

warning: fsockopen() [function.fsockopen]: php_network_getaddresses: getaddrinfo failed: No such host is known. in C:\Program Files\xampp\htdocs\drupal5\sites\all\modules\mtecommerce\smtp\smtp.module on line 1878.
warning: fsockopen() [function.fsockopen]: unable to connect to ssl://smtp.gmail.com :587 (Unknown error) in C:\Program Files\xampp\htdocs\drupal5\sites\all\modules\mtecommerce\smtp\smtp.module on line 1878.
warning: fsockopen() [function.fsockopen]: SSL operation failed with code 1. OpenSSL Error messages: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol in C:\Program Files\xampp\htdocs\drupal5\sites\all\modules\mtecommerce\smtp\smtp.module on line 1878.
warning: fsockopen() [function.fsockopen]: Failed to enable crypto in C:\Program Files\xampp\htdocs\drupal5\sites\all\modules\mtecommerce\smtp\smtp.module on line 1878.
warning: fsockopen() [function.fsockopen]: unable to connect to ssl://:587 (Unknown error) in C:\Program Files\xampp\htdocs\drupal5\sites\all\modules\mtecommerce\smtp\smtp.module on line 1878.