exim.conf screwed up?

[Jeff Elkins <jeffelkins@earthlink.net>]

She who must be obeyed asked me to generate a list of family birthdays, so I 
whipped up a perl script to read a flat file at the beginning of each month 
and report via mail on who's up... However, it seems that my exim.conf is not 
up to snuff. When I enter proper addresses into my script (i.e. 
jeffelkins@earthlink.net) delivery fails with a munged address of: 
jeffelkins.net@elkins.org --- It works if addresses in the perl script are 
left unqualified, pointing to local accounts -- jeff works jeff@elkins.org 
fails. Mail seems to work fine otherwise. 

Where might I have screwed up?

#!/usr/bin/perl

open(MAIL,"|exim -bm -f jeff -t");
print MAIL "To: jeff@elkins.org\n";
print MAIL "From: jeff@elkins.org\n";
print MAIL "CC: jeffelkins@earthlink.net\n";
print MAIL "Subject: Birthdays\n";
print MAIL "X-Generated-By: bday\n";

print MAIL "Upcoming Birthdays\n";
print MAIL "==================\n";

open (BDAY,"/tmp/bday.tmp");

while (<BDAY>) {
 print MAIL $_;
}
close (bday);
close (MAIL);

exim log:

<= jeff@elkins.org U=root P=local S=415
<= jeff@elkins.org U=mail P=spam-scanned S=733 id=E19xnfb-0000I5-00@elkins.org
=> jeff.org <jeff.org@elkins.org> D=spamcheck T=spamc_delivery
** jeff.org@elkins.org: unknown local-part "jeff.org" in domain "elkins.org"
<= <> R=19xnfe-0000IA-00 U=mail P=local S=1536
Error message sent to jeff@elkins.org
Completed