An embedded email image is an image file included directly within the email’s content, allowing it to be displayed inline (i.e., in the body of an HTML email) without requiring the recipient to download it separately. This is achieved by referencing the image via a Content-ID (CID) in the email’s HTML markup. Embedded images are useful for enhancing visual emails, such as newsletters or branded notifications, but they only work in HTML-formatted emails. By default, WordPress sends emails in plain text format. To take advantage of embedded images, you must set the Content-Type header to text/html when calling wp_mail().

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