Emails being bounced by the server

the server is sending emails to any email address except for emails with the same domain name as the site (publicishealthcare.com). I looked at the mail.log and i can see that all the emails are being relayed except for the domain name emails, they are being delayed or bounce due to unknown user.
My domain ARecord @ is pointing to my server but my MX record is pointing to my company's mail server which handles the emails. Please help.

Here's a copy of my mail.log

Oct 20 01:14:06 PublicisHealthcare postfix/pickup[7097]: AA8DF1091AF: uid=33 from=
Oct 20 01:14:06 PublicisHealthcare postfix/cleanup[7185]: AA8DF1091AF: message-id=<20101020011406.AA8DF1091AF@PublicisHealthcare>
Oct 20 01:14:06 PublicisHealthcare postfix/qmgr[6351]: AA8DF1091AF: from=, size=544, nrcpt=5 (queue active)
Oct 20 01:14:06 PublicisHealthcare postfix/virtual[7188]: AA8DF1091AF: to=, relay=virtual, delay=0.06, delays=0.04/0.01/0/0.01$
Oct 20 01:14:06 PublicisHealthcare postfix/virtual[7188]: AA8DF1091AF: to=, relay=virtual, delay=0.06, delays=0.04/0.01/0/0.01, dsn$
Oct 20 01:14:06 PublicisHealthcare postfix/smtp[7189]: AA8DF1091AF: to=, relay=chimail1.us.publicisgroupe.net[167.246.9.164]:25, delay=$
Oct 20 01:14:06 PublicisHealthcare postfix/smtp[7189]: AA8DF1091AF: to=, relay=chimail1.us.publicisgroupe.net[167.246.9.164]:25, delay=0.$
Oct 20 01:14:06 PublicisHealthcare postfix/smtp[7189]: AA8DF1091AF: to=, relay=chimail1.us.publicisgroupe.net[167.246.9.164]:25, delay=0.32,$
Oct 20 01:14:07 PublicisHealthcare postfix/cleanup[7185]: F3DD11091B0: message-id=<20101020011406.F3DD11091B0@PublicisHealthcare>
Oct 20 01:14:07 PublicisHealthcare postfix/qmgr[6351]: F3DD11091B0: from=<>, size=2707, nrcpt=1 (queue active)
Oct 20 01:14:07 PublicisHealthcare postfix/bounce[7190]: AA8DF1091AF: sender non-delivery notification: F3DD11091B0
Oct 20 01:14:07 PublicisHealthcare postfix/qmgr[6351]: AA8DF1091AF: removed
Oct 20 01:14:07 PublicisHealthcare postfix/smtp[7189]: F3DD11091B0: to=, relay=none, delay=0.01, delays=0/0/0/0, dsn=5.4.4, status=bounced$
Oct 20 01:14:07 PublicisHealthcare postfix/qmgr[6351]: F3DD11091B0: removed
Oct 20 08:11:13 PublicisHealthcare postfix/pickup[7875]: DAFB11091AF: uid=0 from=
Oct 20 08:11:13 PublicisHealthcare postfix/cleanup[7932]: DAFB11091AF: message-id=<20101020081113.DAFB11091AF@PublicisHealthcare>
Oct 20 08:11:13 PublicisHealthcare postfix/qmgr[6351]: DAFB11091AF: from=, size=370, nrcpt=1 (queue active)
Oct 20 08:11:15 PublicisHealthcare postfix/smtp[7939]: DAFB11091AF: to=, relay=gmail-smtp-in.l.google.com[74.125.95.27]:25, delay=1.4, delays=0.29/$
Oct 20 08:11:15 PublicisHealthcare postfix/qmgr[6351]: DAFB11091AF: removed
Oct 20 11:38:16 PublicisHealthcare postfix/smtpd[8116]: connect from servermail.gabelgroup.com[85.18.14.242]
Oct 20 11:38:16 PublicisHealthcare postfix/smtpd[8116]: NOQUEUE: reject: RCPT from servermail.gabelgroup.com[85.18.14.242]: 550 5.1.1 <luisa.forti@publicishealthcare.c$
Oct 20 11:38:17 PublicisHealthcare postfix/smtpd[8116]: disconnect from servermail.gabelgroup.com[85.18.14.242]
Oct 20 11:41:37 PublicisHealthcare postfix/anvil[8119]: statistics: max connection rate 1/60s for (smtp:85.18.14.242) at Oct 20 11:38:16
Oct 20 11:41:37 PublicisHealthcare postfix/anvil[8119]: statistics: max connection count 1 for (smtp:85.18.14.242) at Oct 20 11:38:16
Oct 20 11:41:37 PublicisHealthcare postfix/anvil[8119]: statistics: max cache size 1 at Oct 20 11:38:16