Am 14.12.2013 17:44, schrieb JEWEL AHMMED:

I flow the tutorials...

Forget about tutorials. They tell only a very small part of the story, mostly without any explanation why a specific setup is chosen.

But, I can't success.. :(

Please check this links:

[ ... ]

Please tell me which is good ? & Do I need to change any command or step? I want to use mail client for sending & receiving mail Eg. Thunderbird ( SMTP, IMAP, POP3 )

Use the software's original documentation:

http://www.postfix.org/documentation.html

http://wiki2.dovecot.org

If you have no concept about what you are doing to achieve your goal, then you should get good books which explain the basics. Setting up a mailserver (MTA and mail storage/access server) is a tough job these days because all the things involved (DNS, SSL, DKIM, SPAM fighting technics) and having a good knowledge about the various RFCs.

Alexander