View and delete individual messages directly from POP server in OS X Mail There is/was a feature in OS X Mail that allowed to fetch the list of messages from the server in a configured POP account. This fetched only message headers - all at once - and displayed the list in a window then allowed to individually select messages and delete them directly from the server. Not all messages via the Preferences - Accounts - Advanced - Remove now option but individually.

I can't seem to find this option any more. Was this removed from Mail or just well hidden?
If accounts are inside a global Inbox, open the Inbox reveal arrow  
Right Click the individual account Inbox > Get Account Info  


Select the Messages on Server tab  
Wait for it to load, then you can select &amp; delete any/all messages on the server