This method is useless if you need to read a multi-line response from the server. The corresponding carriage return line-feed pair will be stripped from the returned reply automatically. Returns undef on failure. If given a message number, returns the UIDL for that message. If called with no arguments, returns an associative array containing undeleted message number keys and their associated UIDL elements.
Returns undef on failure.
This deletes a specified message number. If no message number is specified, returns false. Sends the POP3 QUIT command to the server and closes the connection. You must call this method if you have deleted any messages. The first line of all server responses automatically have their CRLF stripped.