Dear bill,
Thank u for your reply
I configured 4 users in zimbra for testing (demo1,demo2,demo3,demo4)
and I have put restrictions on demo1 and demo2 that they can only send and receive mails form my domain only for this I have done configuration exactly the same mentioned in the following two links
Restrict users to certain domain - Zimbra :: Wiki RestrictPostfixRecipients - Zimbra :: Wiki
the problem arising is that demo1 and demo2 (restricted users) are able to send mails to each other but demo3 and demo4(full access users) are not able to send mail to demo1 and demo2 although they are receiving their mails from them if demo3 and demo4 tries to send a mail to demo1 and 2 the following error occurs.
any suggestions ....