recipient address must contain a domain

I have set:

>exim -bP receiver_unqualified_hosts
receiver_unqualified_hosts = *.ctd.comsat.com, localhost, neal

This is all hostnames I can think that might be used. Notice:

>hostname
neal

But I test it:

socket neal smtp
220 neal.ctd.comsat.com Exim 0.56 #3 ready at Mon, 21 Oct 1996 10:11:35 -0400
MAIL FROM:<>
250 <> is syntactically correct
RCPT TO:<neal>
501 <neal>: recipient address must contain a domain

So this persists even though I set receiver_unqualified_hosts.