below is the error from my mail log file, can someone help me and tell me whats wrong as i cant seem to send or receive mail.

i know the domain is working ok as i setup a small windows based mail server and adjusted my router and mail was going in and out ok.

Jun 3 23:57:51 mail postfix/master[2625]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling
Jun 3 23:58:51 mail postfix/smtpd[3954]: fatal: need service transport:endpoint instead of "="
Jun 3 23:58:52 mail postfix/master[2625]: warning: process /usr/libexec/postfix/smtpd pid 3954 exit status 1
Jun 3 23:58:52 mail postfix/master[2625]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling
Jun 3 23:59:52 mail postfix/smtpd[3971]: fatal: need service transport:endpoint instead of "="
Jun 3 23:59:53 mail postfix/master[2625]: warning: process /usr/libexec/postfix/smtpd pid 3971 exit status 1
Jun 3 23:59:53 mail postfix/master[2625]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling
Jun 4 00:00:30 mail postfix/postfix-script[3991]: stopping the Postfix mail system
Jun 4 00:00:30 mail postfix/master[2625]: terminating on signal 15
Jun 4 00:00:31 mail postfix/postfix-script[4065]: starting the Postfix mail system
Jun 4 00:00:31 mail postfix/master[4066]: daemon started -- version 2.7.0, configuration /etc/postfix
Jun 4 00:01:21 mail postfix/postfix-script[4341]: refreshing the Postfix mail system
Jun 4 00:01:21 mail postfix/master[4066]: reload -- version 2.7.0, configuration /etc/postfix
Jun 4 00:01:24 mail postfix/postfix-script[4429]: stopping the Postfix mail system
Jun 4 00:01:24 mail postfix/master[4066]: terminating on signal 15
Jun 4 00:01:27 mail postfix/postfix-script[4577]: starting the Postfix mail system
Jun 4 00:01:27 mail postfix/master[4578]: daemon started -- version 2.7.0, configuration /etc/postfix
Jun 4 00:01:35 mail postfix/smtpd[4656]: fatal: need service transport:endpoint instead of "="
Jun 4 00:01:36 mail postfix/master[4578]: warning: process /usr/libexec/postfix/smtpd pid 4656 exit status 1
Jun 4 00:01:36 mail postfix/master[4578]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling

You probably have a typo in one of your configuration files, probably in master.cf. Looking at {fatal: need service transport:endpoint instead of "="} tells me that one of the delivery options, which are specified in master.cf is messed up somehow.