The categories feature is specific to certain email clients and protocols, and it may not be supported in all mail clients or when using the POP3 protocol. POP3 is a basic email retrieval protocol that does not provide the same level of folder management as more advanced protocols like IMAP. As a result, the categories folders may not be visible or accessible when using POP3.
To fully utilize the categories feature and access the folders, we recommend using an email client that supports IMAP or accessing your emails through Webmail or the Mobile Web clients. These platforms offer enhanced folder management capabilities and better compatibility with the categories feature, allowing you to take full advantage of the organized email experience.