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PHP 7.3 reaches end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in April 2022. You may want to consider planning your upgrade now to Adobe Commerce 2.4.x and PHP 7.4.x to help maintain PCI compliance.

SendFriend

The Magento_SendFriend implements the functionality behind the “Email to a Friend” link on a product page, which allows to share favorite products with others by clicking the link.