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Click on the Mail tracker from the admin side main navigation or from the Mail tracker icon from the Dashoard page

Note: this feature for PRO only and it can be disabled from the global configuration

Mail Tracker (defaults to Yes). When enabled, it will listen to and log email-sending activities from your Joomla! website, allowing you to monitor the status of your site's outgoing emails. You can also review the contents, subjects, and attachments of those emails, check whether they were successfully sent, and manually resend them to specific addresses from individual email records.