[Warning] Your application (using socks5 to port 587) is..

'..giving Tor only an IP address. Applications that do DNS resolves themselves may leak information. Consider using Socks4A (e.g. via privoxy or socat) instead. For more information, please see http://wiki.noreply.org/noreply/TheOnionRouter/TorFAQ#SOCKSAndDNS'

These are the warning message being generate in Vidalia (0.1.9 (Message Log)) using Tor (0.2.0.31 (r16744)) and Privoxy (0000070c), when using ports 587 & 993 in Mozilla Thunderbird 2.0.0.16 with the following proxy settings:

HTTP Proxy: 127.0.0.1 - Port: 8118
SSL Proxy: 127.0.0.1 - Port: 8118
SOCKS Host: 127.0.0.1 - Port: 9050
SOCKS v5
No Proxy for: localhost, 127.0.0.1

Is this anything to be concerned about? If so what else do I need to amend?

Many thanks in advance.
Duke