Hello, Abhinandan,
Thank you for contacting us and for using XStore.
Please read this article – https://woocommerce.com/document/email-faq/
Check how emails work when our email builder is disabled (XStore > Email Builder).
Also, check how it works when no XStore theme is activated, but a default WooCommerce theme – Storefront (Appearance > Themes).
Let us know the results of the tests.
We strongly recommend that you create a complete backup of your site before proceeding with these steps.
If the issue continues regardless of the theme being used, it suggests that the problem may not be related to the theme itself.
We recommend that you reach out to your hosting provider to review the server mail log. Additionally, it would be prudent to contact WooCommerce plugin support concurrently for further assistance – https://wordpress.org/support/plugin/woocommerce/
Best Regards,
8Theme’s Team