DeleteMessage Method
Deletes a message from the server-side mailbox.
Syntax
pop3client.deleteMessage(index, [callback])
Callback
The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).
The callback for this method is defined as:
function(err){ }
'err' is the error that occurred. If there was no error, then 'err' is 'null'.
'err' has 2 properties which hold detailed information:
err.code err.message
Remarks
Call this method to delete a message from the mailbox.
Note that the message may not be deleted immediately. It is typical for POP3 servers to only mark messages for deletion upon receipt of this command, and only delete them after the connection has been gracefully closed.
If needed, messages can be "undeleted" during the same session by calling the Undelete method.