hi guys! I just want to consult you regarding outlook matter i cannot send to yahoo emails or gmail... is there anyway i can reconfigure my zimbra server?...

Release 5.0.14_GA_2850.UBUNTU8 UBUNTU8 FOSS edition

here is the zimbra log... Thanks in advance

May 24 09:20:23 mail postfix/smtpd[26455]: warning: 122.52.214.34: hostname 122.52.214.34.pldt.net verification failed: Name or service not known
May 24 09:20:23 mail postfix/smtpd[26455]: connect from unknown[122.52.214.34]
May 24 09:20:24 mail postfix/smtpd[26455]: NOQUEUE: reject: RCPT from unknown[122.52.214.34]: 554 5.7.1 <scarface_karl@yahoo.com>: Relay access denied; from=<rp.rojero@mail.ants.ph> to=<scarface_karl@yahoo.com> proto=SMTP helo=<KARL>
May 24 09:20:24 mail postfix/smtpd[26455]: disconnect from unknown[122.52.214.34]