I can confirm that the email in question went out successfully and was delivered to Hunter's mail system.
[root@commons ~]# grep mfabrica@hunter.cuny.edu /var/log/maillog*
/var/log/maillog-20120923:Sep 18 13:30:04 commons postfix/smtp[19414]: 82539174891: to=<mfabrica@hunter.cuny.edu>, relay=relay.gc.cuny.edu[172.29.28.89]:25, delay=0.39, delays=0.19/0.01/0.01/0.18, dsn=2.6.0, status=sent (250 2.6.0 <54e30734e25c28d1b7ef7feab3c11b0d@commons.gc.cuny.edu> Queued mail for delivery)
/var/log/maillog-20120923:Sep 20 16:40:33 commons postfix/smtp[11631]: B4BB51744F0: to=<mfabrica@hunter.cuny.edu>, relay=relay.gc.cuny.edu[172.29.28.90]:25, delay=0.22, delays=0.01/0/0/0.21, dsn=2.6.0, status=sent (250 2.6.0 <e637276e62af2cca102f5894398676eb@commons.gc.cuny.edu> Queued mail for delivery)
/var/log/maillog-20120923:Sep 20 17:19:11 commons postfix/smtp[15883]: C8735174548: to=<mfabrica@hunter.cuny.edu>, relay=relay.gc.cuny.edu[172.29.28.89]:25, delay=0.18, delays=0.03/0.01/0/0.13, dsn=2.6.0, status=sent (250 2.6.0 <a447dc26b4f49bb910be7beae7770348@commons.gc.cuny.edu> Queued mail for delivery)
[root@commons ~]# grep C8735174548 $_
Sep 20 17:19:11 commons postfix/pickup[10342]: C8735174548: uid=48 from=<apache>
Sep 20 17:19:11 commons postfix/cleanup[15881]: C8735174548: message-id=<a447dc26b4f49bb910be7beae7770348@commons.gc.cuny.edu>
Sep 20 17:19:11 commons postfix/qmgr[6052]: C8735174548: from=<apache@commons.gc.cuny.edu>, size=1071, nrcpt=1 (queue active)
Sep 20 17:19:11 commons postfix/smtp[15883]: C8735174548: to=<mfabrica@hunter.cuny.edu>, relay=relay.gc.cuny.edu[172.29.28.89]:25, delay=0.18, delays=0.03/0.01/0/0.13, dsn=2.6.0, status=sent (250 2.6.0 <a447dc26b4f49bb910be7beae7770348@commons.gc.cuny.edu> Queued mail for delivery)
Sep 20 17:19:11 commons postfix/qmgr[6052]: C8735174548: removed