[exim] rejected mail in log without reason

Hi I am seeing entries in log such as this not telling me why email is
been rejected, is there a way to make exim show the reason and do I
have anything to worry about?

thanks.

Chris

2006-11-03 21:14:15 H=(CP155.eiulk5oe.com) [58.210.252.34]:9652
I=[85.14.x.x]:25 F=<glennon44ku@???> rejected RCPT
<contact@???>:

local ips and domains edited out.