WordSMTP - WordPress Simple SMTP
Frst Activate WordSMTP Plugin.
After activated the plugin you should see the WordSMTP Menu.
Complete the WordSMTP setting options to make it work with your WordPress or WooCommerce.
After complete the WordSMTP setting options to be sure test your email setting. If it works fine then you should see success message or if it does not work then your see failed message with all debug info detail.
To send your all WooCommerce emails you just need to provide your verified email address or SMTP user address what you provided as SMTP user/login at Setting page. You should go WooCommerce->Settings then under 'Emails' Tab you should see the WooCommerce Email sender options.