mail can not send from client mail on PC

[mintux]

hi
i have debain lenny and ispcp v1
i have no problem to send and receive mail with webmail
but in mail client like kmail or ... i can receive mail but i can't send mail and i got this error

Code:

Sending failed:
      Message sending failed since the following recipients were rejected by the server:
      piri.hamid@gmail.com (The server responded: "5.7.1 <xxxx@gmail.com>: Relay access denied")
      linux.mrg@gmail.com (The server responded: "5.7.1 <xxxx@gmail.com>: Relay access denied")
      The message will stay in the 'outbox' folder until you either fix the problem (e.g. a broken address) or remove the message from the 'outbox' folder.
      The following transport was used:
       xxxx@mysite.com

it's my log

Code:

May  4 07:14:07 cl-t191-360cl postfix/smtpd[14258]: NOQUEUE: reject: RCPT from unknown[89.165.113.105]: 554 5.7.1 <linux.xxxx@gmail.com>: Relay access denied; from=<xxxx@mysite.com> to=<linux.xxxx@gmail.com> proto=ESMTP helo=<xxxx-desktop.localnet>
May  4 07:14:08 cl-t191-360cl postfix/smtpd[14258]: disconnect from unknown[89.165.113.105]
May  4 07:17:28 cl-t191-360cl postfix/anvil[14260]: statistics: max connection rate 1/60s for (smtp:89.165.113.105) at May  4 07:14:06
May  4 07:17:28 cl-t191-360cl postfix/anvil[14260]: statistics: max connection count 1 for (smtp:89.165.113.105) at May  4 07:14:06
May  4 07:17:28 cl-t191-360cl postfix/anvil[14260]: statistics: max cache size 1 at May  4 07:14:06
May  4 07:17:57 cl-t191-360cl postfix/master[14203]: terminating on signal 15
May  4 07:17:57 cl-t191-360cl postfix/master[14372]: daemon started -- version 2.5.5, configuration /etc/postfix
May  4 07:18:07 cl-t191-360cl postfix/smtpd[14380]: connect from unknown[89.165.113.105]
May  4 07:18:08 cl-t191-360cl postfix/smtpd[14380]: NOQUEUE: reject: RCPT from unknown[89.165.113.105]: 554 5.7.1 <xxxx@gmail.com>: Relay access denied; from=<xxxx@mysite.com> to=<xxxx@gmail.com> proto=ESMTP helo=<xxxx-desktop.localnet>
May  4 07:18:08 cl-t191-360cl postfix/smtpd[14380]: NOQUEUE: reject: RCPT from unknown[89.165.113.105]: 554 5.7.1 <linux.xxxx@gmail.com>: Relay access denied; from=<xxxx@mysite.com> to=<xxxx@gmail.com> proto=ESMTP helo=<xxxx-desktop.localnet>

and it's my config

Code:

# SASL paramters
smtpd_sasl_auth_enable       = yes
smtpd_sasl_security_options  = noanonymous
smtpd_sasl_local_domain      =
broken_sasl_auth_clients     = yes

smtpd_helo_required          = yes

smtpd_helo_restrictions      = permit_mynetworks,
                               permit_sasl_authenticated,
                               reject_invalid_helo_hostname,
                               reject_non_fqdn_helo_hostname

smtpd_sender_restrictions    = reject_non_fqdn_sender,
                               #reject_unknown_sender_domain,
                               permit_mynetworks,
                               permit_sasl_authenticated

smtpd_recipient_restrictions = reject_non_fqdn_recipient,
                               reject_unknown_recipient_domain,
                               permit_mynetworks,
                               permit_sasl_authenticated,
                               reject_unauth_destination,
                               reject_unlisted_recipient,
                              # check_policy_service inet:127.0.0.1:12525,
                              # check_policy_service inet:127.0.0.1:60000,
                               permit

smtpd_data_restrictions      = reject_multi_recipient_bounce,
                               reject_unauth_pipelining

which one of this must be disable to postfix doesn't reject mail wants send from mail client from PC