Hi.
Hope I can help you out here
'blank email'.
Im guessing it might simply be an automatic read reciept !!
Thats a setting in Outlook Express. ( as in "your mail was read at.....")
If not goto your lunarpages control panel and check if you have autoresponder set to reply to posts.
If so either switch autoresponder off. Or enter text into the reply window.
That way your sender will recieve a "thank you for your mail to......."
 instead of a blank

I cant check it out from here as you seem to have a very strange homepage