[ic] When search value contains '@', search results does'nt work

[interchange-users@interchange.redhat.com (murahashi)]

I have a problem with search spec like below.
When search value contains '@' search results does'nt work, but it works
well without '@' .
Can't we use specail character '@' in search value?
How can we specify '@' in search value?

[search-region arg="
    st=db
    fi=userdb
   co=yes
   sf=mail_list
   op=eq
   se=1
   sf=email
   se=@docomo.ne.jp
   op=rn
   tf=email
   rf=username,email,lname,fname
   ml=99999
  "]

Thanks,
Murahashi