[exim] googlebox SMTP protocol violation: synchronization er…

Hi,
a client has installed a goooglebox in his /29 , he's told it to use the
exim box as smtp server, ive told exim to relay for its ip - but all it
seems to do is...

2006-06-12 23:09:37 SMTP protocol violation: synchronization error
(input sent without waiting for greeting): rejecte
d connection from H=[84.23.9.218] input="HELO 84.23.9.218\nQUIT\n"

Lots and lots of that..

So, is there anything I can do to accomodate it this end, or is the
problem with the googlebox?

Thanks

--
Pete