How to set the return-path within your Magento 1 installation to correct issues with sending emails to specific providers, such as when they inaccurately flag them as spam.
Setting the return-path email designates an email address for all failed emails. By default, most mail servers use the server’s email address for failed deliveries, preventing you from seeing those failed emails. It also resolves issues with customers not receiving system emails relating to registration, password recovery, and order notification.
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