I found this disturbing e-mail in my inbox the other day. What does it mean?

------------------
TO YOU:

I AM DR. ONE DRONE. I HAVE ARRIVED TO THIS PLACE FROM A CITY NEAR ANOTHER PLACE. I ASK THAT YOU LEND ME YOUR FAVORED LIMB. I HAVE NEED OF A FAVORED LIMB. MY FAVORED LIMB HAS BEEN DAMAGED. I HAVE NEED OF YOURS SO THAT I MAY REPAIR MY FAVORED LIMB. I REQUEST THAT YOU SEND ME A LIMB, PREFERABLY ONE THAT YOU FAVOR. I AM A DOCTOR. I AM PROGRAMMED TO REPAIR FAVORED LIMBS. ERROR. I MEANT TO SAY THE WORD "TRAINED" INSTEAD OF THE WORD "PROGRAMMED." I HAVE MADE AN ERROR LIKE ALL OTHER HUMANS. I AM CLEARLY A HUMAN. PLEASE SEND ME YOUR FAVORED LIMB IN A STURDY BOX TO:

746 ADDRESS STREET
CITY NEAR ANOTHER PLACE, ARBITRARY REGION
ARBITRARY POLITICAL REGION, 01101101

I WILL THANK YOU UPON RECEPTION. UNTIL THEN, I BID YOU A FOND FAREWELL AND GOOD LUCK IN ALL OF YOUR ENDEAVORS AND OTHER VARIOUS HUMAN PLEASANTRIES.

SYNTHETICALLY YOURS,
DR. ONE DRONE

POSTSCRIPT: I AM NOT A DRONE. MY NAME IS COINCIDENTAL. OKAY. BYE. NO. WAIT. SEND YOUR LIMB. OKAY. BYE.
------------------

I think he might be lying about something. I still haven't received a "thank you."