The following is a list of "bounced" e-mail from the G4G9 correspondence. If you know a valid e-mail or contact information, please e-mail: thomasmrodgers@gmail.com or use the comment section of the "Pre-register Form"  to submit the corrected information. Thank you for your time.

gplants@houston.rr.com
baez@ucrmath.ucr.edu
aviolant@pie.xtec.es
aliu@math.ualberta.ca
jdbecker@shell1.ncal.verlo.com
email@johnrobinson.com
daa@ch.kcl.ac.uk
mihelich@math.princeton.edu
rclehman@mit.edu
Konstantinos@olympicube.com
malakus_6@yahoo.com
lewisgarvin@fastmail.fm
louis_zocchi@hotmail.com
kcgeorge@md4.vsnl.net.in
kc.cole@latimes.com
jrw2010@geometrygames.org
Jeremy@bart.cc
jhaubrich@freeler.nl
jcmeyrignac@gmail.comeuler@free.fr
info@penn-teller.com
hraizer@exis.net
gshapiro@nysun.com
giobbi@smile.ch
ginnever@earthlink.net
gale@math.berkeley.edu
eswab@adelphia.net
edward@karentaussigproductions.com
edi@witful.net
doug@heartscan.com
dondechman@verizon.net
dkwashburn@worldnet.att.net
kathalida@earthlink.net
borisa@mit.edu
blenheim@sri.lanka.net
billwatson@earthlink.net
benyus@montana.com
a.f.van.der.plaat@hccnet.nl
aaron@aaronkellner.com
puzzles@jps.net