Magento 2 Site Maintenance Extension - Cynoinfotech
https://www.cynoinfotech.com/product/site-maintenance-for-magento-2/
Magento 2 coming soon page extension helps you notify your customers via email that the site is under maintenance mode or coming soon by showing a timer. The Magento 2 coming soon Page extension allows you to show user-friendly notices to your users while the website is in maintenance mode.
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