[exim] weird line

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著者: Brent Clark
日付:  
To: exim
題目: [exim] weird line
Hi all

I just found this weird ONE line entry in my maillog:
2005-08-16 09:18:17 H=(mx2.timco.co.za) [196.15.175.140] U=25 F=<> rejected RCPT <866517@???>: Unrouteable address

What interest me is:
U=25

Would anyone be able to help me understand this.

Kind Regards
Brent Clark