Deletion of Read emails via POP

Deletion of Read emails via POP

I generally retrieve emails from my Zoho mail account via POP3 rather than via a web browser.   The mail client is set up to delete retrieved emails from the mail server (Zoho).   If another POP3 mail client accesses the Zoho email server later the emails that have already been retrieved do not download via POP (which is correct).   However, when I login to Zoho via a browser all of these emails are still showing as new emails.   Shouldn't these "read" emails be moved into the Trash folder on Zoho or be deleted?   Is there a setting that I am overlooking for this ?   Otherwise, they continue to accumulate until I manually delete them in the web browser.