Yes, 72rocks.net can receive emails.
Yes, 72rocks.net seems to be a legitimate domain.
A record
216.239.32.21
MX records
alt1.aspmx.l.google.com
64.233.186.26
alt2.aspmx.l.google.com
209.85.202.27
aspmx.l.google.com
173.194.175.26
aspmx2.googlemail.com
64.233.186.27
aspmx3.googlemail.com
209.85.202.27
aspmx4.googlemail.com
74.125.206.26
aspmx5.googlemail.com
74.125.128.27