weird mail errors

[Littlefield, Tyler]

Hello list,
I'm getting the following errors when I try to mail from deb.
2007-05-05 02:09:06 1HkFKE-0003gU-00 Expansion of ${lookup{$1}lsearch{/etc/email-addresses} failed while
rewriting: missing } at end
 of string
2007-05-05 02:09:06 1HkFKE-0003gU-00 Expansion of ${lookup{$1}lsearch{/etc/email-addresses} failed while rewriting: missing } at end
 of string
2007-05-05 02:09:06 1HkFKE-0003gU-00 Expansion of ${lookup{$1}lsearch{/etc/email-addresses} failed while rewriting: missing } at end graphic 581  of string
2007-05-05 02:09:06 1HkFKE-0003gU-00 Expansion of ${lookup{$1}lsearch{/etc/email-addresses} failed while rewriting: missing } at end
 of string 
Any ideas?
Thanks,