Currently I have two WooCommerce setups both running on the same server for demonstration and testing purposes. Each is installed on a different subdomain. One sends out registration and forgot password emails ("working" version) but the other does not ("fail" version). Both use WP latest (3.8).
The "working" version is running 100% default everything and the Twenty Twelve theme with WooCommerce dummy data imported.
The "fail" version is running a custom theme and several plugins (various WooCommerce payment gateways, Advanced Custom Fields, and a Mailchimp plugin). When I change the theme to Twenty Twelve and delete ALL plugins except those running on the "working" version I still cannot get any registration or lost password emails to send. Tested with multiple email addresses.
Any help troubleshooting would be greatly appreciated!
After following @Subharanjan's advice here are the relevant entries in my
array ( 'error_count' => 1, 'sign_cert_file' => '', 'sign_key_file' => '', 'sign_key_pass' => '', 'exceptions' => true, )