CentOS - Dec 2013 - Problem with Mail Server CentOS 6.5 (Postfix, Dovecot)

I flow the tutorials...
But, I can't success.. :(

Please check this links:

http://www.unixmen.com/install-postfix-mail-server-with-dovecot-and-squirrelmail-on-centos-6-4/

http://www.krizna.com/centos/setup-mail-server-in-centos-6/#postfix

http://linuxdrops.com/install-postfix-with-cyrus-on-centos-rhel-fedora/

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 )

I flow the tutorials...
But, I can't success.. :(

Please check this links:

http://www.unixmen.com/install-postfix-mail-server-with-dovecot-and-squirrelmail-on-centos-6-4/

http://www.krizna.com/centos/setup-mail-server-in-centos-6/#postfix

http://linuxdrops.com/install-postfix-with-cyrus-on-centos-rhel-fedora/

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 )

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