Someone

postconf -n
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
html_directory = no
mail_owner = postfix
mailq_path = /usr/bin/mailq
manpage_directory = /usr/local/man
mydestination = $mydomain, localhost.$mydomain
mydomain = laknet.lk
myhostname = mail.laknet.lk
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = no
sample_directory = /etc/postfix
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination
smtpd_sasl_auth_enable = yes
unknown_local_recipient_reject_code = 550


my log file - mail send with out look and "My server requires authentication" disabled 

Oct 27 14:35:55 angle postfix/smtpd[6155]: connect from unknown[10.64.78.132]
Oct 27 14:35:55 angle postfix/smtpd[6155]: D28F411165: client=unknown[10.64.78.132]
Oct 27 14:35:55 angle postfix/cleanup[6158]: D28F411165: message-id=<000e01c81880$56c8a650$844e400a@DATA04>
Oct 27 14:35:55 angle postfix/qmgr[13970]: D28F411165: from=<user1@laknet.lk>, size=1319, nrcpt=1 (queue active)
Oct 27 14:35:55 angle postfix/smtpd[6155]: disconnect from unknown[10.64.78.132]
Oct 27 14:35:55 angle postfix/local[6159]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Oct 27 14:35:55 angle postfix/local[6159]: D28F411165: to=<user2@laknet.lk>, relay=local, delay=0.11, delays=0.07/0.02/0/0.01, dsn=2.0.0, status=sent (delivered to mailbox)



my log file - mail send with out look and "My server requires authentication" enabled 

Oct 27 14:39:47 angle postfix/smtpd[6167]: connect from unknown[10.64.78.132]
Oct 27 14:39:47 angle postfix/smtpd[6167]: 9413F11165: client=unknown[10.64.78.132], sasl_method=LOGIN, sasl_username=user1
Oct 27 14:39:47 angle postfix/cleanup[6188]: 9413F11165: message-id=<000601c81881$4dc086d0$844e400a@DATA04>
Oct 27 14:39:47 angle postfix/qmgr[13970]: 9413F11165: from=<user1@laknet.lk>, size=1320, nrcpt=1 (queue active)
Oct 27 14:39:47 angle postfix/smtpd[6167]: disconnect from unknown[10.64.78.132]
Oct 27 14:39:47 angle postfix/local[6189]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Oct 27 14:39:47 angle postfix/local[6189]: 9413F11165: to=<user2@laknet.lk>, relay=local, delay=0.13, delays=0.09/0.03/0/0.01, dsn=2.0.0, status=sent (delivered to mailbox)