[exim] fetchmail mda 127 error

Hello!

i'm using fetchmail to get mails from pop3 servers and then exim
delivers them to the local mailboxes. One local user gets mail from
myspace.com. The sender address looks really strange and returns with
the errorlevel 127.

fetchmail mda config:
mda "/usr/sbin/exim4 -oi -f '<%F>' 'recipient@???'"


resulting exim command:
/usr/sbin/exim4 -oi -f \
'<'03|m|gc8ggg0ae|4n6_7.r_kwllo|_|zrks1r@???'>'\
'recipient@???'

Header data:
Received: from DBMQ07 (127.0.0.1) by vmta02.myspace.com
from: "New MySpace Message" \
<03|p|gc8ggg0ae|4n6_7.r_kwllo|_|zrks1r@???>
reply-to: "New MySpace Message" \
<03|p|gc8ggg0ae|4n6_7.r_kwllo|_|zrks1r@???>
Sender: 03|p|gc8ggg0ae|4n6_7.r_kwllo|_|zrks1r@???

I have tried changing '<%F>' to "<%F>" but it doesn't work. Any hints
for masking this email address?

Thanks in advance for your help!

greetings from f_x