Mailpoet 3 not sending emails

Hi, the plugin is not sending regular emails, however it sends test email with or without SMTP. this is the system info generated by plugin

name: site_name_hidden
email: user_name_hidden@site_name_hidden.com
PHP version: 5.5.37
MailPoet Free version: 3.7.0
MailPoet Premium version: N/A
MailPoet Premium/MSS key: 
WordPress version: 4.9.5
Database version: 5.6.32-78.1
Web server: Apache
Server OS: Linux gator4265.hostgator.com 3.10.0-693.11.6.1.ELK.el6.x86_64 #1 SMP Tue Jan 23 10:30:30 MST 2018 x86_64
WP_MEMORY_LIMIT: 40M
WP_MAX_MEMORY_LIMIT: 256M
WP_DEBUG: false
PHP max_execution_time: 0
PHP memory_limit: 1024M
PHP upload_max_filesize: 64M
PHP post_max_size: 64M
WordPress language: en_US
Multisite environment?: No
Current Theme: Porto Child (version 1.1)
Active Plugin names: Ultimate_VC_Addons/Ultimate_VC_Addons.php, aftership-woocommerce-tracking/aftership.php, all-404-redirect-to-homepage/all-404-redirect-to-homepage.php, all-in-one-wp-migration/all-in-one-wp-migration.php, contact-form-7/wp-contact-form-7.php, duplicator/duplicator.php, dynamic-featured-image/dynamic-featured-image.php, email-return-path-fix/email-return-path-fix.php, good-reviews-wp/good-reviews-wp.php, js_composer/js_composer.php, kwayy-html-sitemap/kwayy-html-sitemap.php, mailpoet/mailpoet.php, masterslider/masterslider.php, porto-content-types/porto-content-types.php, porto-shortcodes/porto-shortcodes.php, porto-widgets/porto-widgets.php, post-type-archive-links/post-type-archive-links.php, really-simple-captcha/really-simple-captcha.php, really-simple-ssl/rlrsssl-really-simple-ssl.php, shortpixel-image-optimiser/wp-shortpixel.php, ssl-insecure-content-fixer/ssl-insecure-content-fixer.php, wc-aelia-foundation-classes/wc-aelia-foundation-classes.php, woocommerce-2checkout-payment/index.php, woocommerce-direct-bulk-category-discount/dbc-discount.php, woocommerce-gateway-paypal-express-checkout/woocommerce-gateway-paypal-express-checkout.php, woocommerce-tm-extra-product-options/tm-woo-extra-product-options.php, woocommerce/woocommerce.php, wordfence/wordfence.php, wordpress-seo/wp-seo.php, wp-fastest-cache/wpFastestCache.php, wp-mail-bank/wp-mail-bank.php, wp-sitemap-page/wp-sitemap-page.php, yith-woocommerce-ajax-navigation/init.php, yith-woocommerce-ajax-search/init.php, yith-woocommerce-wishlist/init.php
Sending Method: SMTP
Sending Frequency: 25 emails every 5 minutes
Task Scheduler method: WordPress
Cron ping URL: https://www.site_name_hidden.com?mailpoet_router&endpoint=cron_daemon&action=ping(this returns pong)
Default FROM address: info@site_name_hidden.com
Default Reply-To address: info@site_name_hidden.com
Bounce Email Address: info@site_name_hidden.com
Total number of subscribers: 81