"LISTSERV list owners' forum" <[log in to unmask]> wrote on 
03/09/2007 12:32:28 PM:

> I suspect that if the recipients of one of those blank messages view 
> the message in plain text mode, its contents will show up.

I have one list with one user that has been reported as sending blank 
messages.  THe subscriber uses Outlook and an Exchange server (forget 
versions off the top of my head).  The blank messages only occur if she is 
replying to a message from the list, going back to the list.  Most of the 
times, it isn't completely blank.  There is a line of XML code.  If I look 
at the page source for the message, there is a plain text part, but most 
mail clients default to showing the rich text part if available.  In these 
messages, the rich text is a hideous mash of HTML with more codes than an 
Enigma Machine.  This list is fairly small (20 subs) but to the best of my 
knowledge, no one can read these blank emails, regardless of client. IIRC, 
they even show up as blank when the get back to the sender (we default all 
lists as ACK,REPRO).