Restricting users cannot send mail to off-site Domains

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Problem 
 Restricting users cannot send mail to off-site Domains

Solution
 # cd /etc/postfix/ 
Create The File 
1.   local_domains  => edit the file your Domain Name
new.com   OK

2.   senders_user =>  edit the file restricted Users Name this users cannot send mail to off-site Domains
fl@new.com          local_only
amit@new.com          local_only
##################################################

# vim /etc/postfix/main.cf
smtpd_restriction_classes = local_only
local_only =
   check_recipient_access hash:/etc/postfix/local_domains, reject
smtpd_recipient_restrictions =
        check_sender_access hash:/etc/postfix/senders_user,
        permit_mynetworks,
        reject_unauth_destination,
        permit

# postmap hash:/etc/postfix/local_domains
# postmap hash:/etc/postfix/sender_user
# /etc/init.d/postfix restart

Testing 

[raju@a]# telnet localhost 25  ====>  fl@new.com Not send Other Domains
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 a.raju.com ESMTP Postfix
HELO raju
250 a.raju.com
Mail From:<fl@new.com>
250 2.1.0 Ok
RCPT TO:<abc@gmail.com>
554 5.7.1 <fl@new.com>: Sender address rejected: Access denied
^]
telnet> q
Connection closed.

[raju@a]#  telnet localhost 25 ====> rajiv@new.com  send Other Domains
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 a.raju.com ESMTP Postfix
HELO raju
250 a.raju.com
Mail From:<rajiv@new.com>
250 2.1.0 Ok
RCPT TO:<abc@gmail.com>
250 2.1.5 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
sdfsdfs
sdafsdaf.
.
telnet> q
Connection closed.

[raju@a]# telnet localhost 25  ===> fl@new.com send only Local  Domains
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'.
220 a.raju.com ESMTP Postfix
HELO raju
250 a.raju.com
MAil From:<fl@new.com>
250 2.1.0 Ok
RCPT TO:<rajiv@new.com>
250 2.1.5 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
sdfsaf
asdsafsaf
.

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