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i have no experience on postfix, but i want to work for it, here is some my search for help installation and configuration postfix.
may u get some thing u want .
if u sucsessfull then please write a step by step guied for others from installation to configuration.
Well, it would appear that your ability to relay the messages thru your isp's mailserver are rejected. Remember that you are using an MTA(mail txfer agent) as opposed to an MUA(mail user agent-like your mail reader-mutt, pine, Kmail, etc). I was floored by the fact that, while I was setting up my Postfix for the first time(two comps, little home lan) that the reject notices my ISP(earthlink) kept sending me were run thru THEIR Postfix server. Try to google for "'your-isp'+reject+relay". See if others have the same trouble
You'll need/want to read/follow/edit the main.cf to change those things pertaining to you sending and recieving mail.
Follow your documentation that comes with the postfix source, and also the documents referred to above. If you have any specific questions regarding a directive that isn't well defined (I can't think of one right now) feel free to post up about it.
You need to, at the VERY least, edit the hostname and mydomain variables to your hostname and domain.