Test reply to see which IP gets used.
I see one difference in the headers between your post. When your public IP
address is showing, your post includes these lines:
X-Antivirus: avast! (VPS 000748-5, 13/06/2007), Outbound message
X-Antivirus-Status: Clean
When your post is showing 127.0.0.1 I don't see those lines. I would suspect
something about the way your anti virus program is working.
BTW, when I installed Avast, I did not select for it to scan client
messages.
--
Norman
~Doko ni mo nai sono basho e
~Ima hajimaru utagoe ga
~Todoite-iru, michibiite'ru
~Takaraka ni to heaven