strange empty mail

Hi all!

I'm not sure if this is really a problem, but I thought I'd see if anyone
had any thoughts. On the domain at work, I keep getting strange mail, with
no 'to', no 'subject' and the body just 'DATA'. If this is just some idiot
messing about, I don't care, I have a delete button, but I'm concerned it
might be a result of sendmail or something screwing up (I use PHP's mail
function quite a lot on the page to deal with forms and such). Has anyone
else had anything like this? Does anyone know what it might be?

TIA

Sue

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