[Qemu-devel] Help with git send-email

[G 3]

Everytime I try to send a patch using 'git send-email', I receive  
this error:

<qemu-devel@nongnu.org>: host mx10.gnu.org[199.232.76.166] said:
    550-Verification failed for <localhost>
    550-Unrouteable address 550 Sender verify failed (in reply to  
RCPT TO
    command)
How do I make it so that I can send patches using git on Mac OS X?