Not sure I will ever get this right...

Sent and received:
Katie
markbarendt
Laurent
JohnMeadows
hpulley
Mike Hiscock

Sent only:
piu58
puptent
anakin
JNaetke
ccross
hankins27

Received only:
paul_c5x4
Ken Nadvornick
BirgerA

Neither sent nor received:
Christopher Walrath
ghostcount
bill williams
dfoo
lorirfrommontana
Black Dog
sage