[exim] Thunderbird

Can anybody tell me why for thunderbird client the exim log entry reads

2005-03-16 14:46:09 1DBZmj-0002Zt-U7 H=([131.231.83.115])
[131.231.83.115] I=[158.125.1.219]:587 Warning: Client=

Whereas for outlook users it reads

2005-03-16 14:47:45 1DBZoH-0002bQ-PW H=(hallnetcvgch) [131.231.252.158]
I=[158.125.1.219]:465 Warning: Client=Microsoft Office Outlook, Build
11.0.6353

I wanted to find out how many of each client we were seeing.

Ron
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Ron McKeating
Senior IT Services Specialist
Computing Services
Loughborough University
01509 222329