How to setup email server in ubuntu 12.04LTS(debian 7 wheezy/sid) running on linode vps

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http://serverfault.com – I am working on email server, since i tried several times to create email server on ubuntu12.04LTS with postfix + dovecote + postfixadmin + courier + clamav + spamassassin. But everytime i install these packages i face new problems, like mails send to localhost users and found in users maildir. But I can't determine how to configure/setup for send an email to external smtp like gmail, yahoo. The most worst thing i can't determine how to use sasl, because i am not using SSL so it is not worthy for my domain. This is so complicated, i search everywhere on google: links are https://help.ubuntu. (HowTos)