[Exim] Incomplete transaction from backup mx?

Hello users,

I do see a significant number of the following log info in the mainlog
of my primary server:

2004-01-12 15:05:33 H=longonot.wananchi.com [62.8.64.2] incomplete
transaction (QUIT) from <> for XXXX@???


62.8.64.2 is my backup mx.
What would you consider the likely cause of this behaviour?

        cheers
       - wash
+----------------------------------+-----------------------------------------+
Odhiambo Washington                     . WANANCHI ONLINE LTD (Nairobi, KE)  |
<wash at wananchi dot com>              . 1ere Etage, Loita Hse, Loita St.,  |
GSM: (+254) 722 743 223                 . # 10286, 00100 NAIROBI             |
GSM: (+254) 733 744 121                 . (+254) 020 313 985 - 9             |
+---------------------------------+------------------------------------------+
"Oh My God! They killed init! You Bastards!"
                         --from a /. post