What is a Post Fix, Can some one explain in a very Simple Language.
I have a dedicated server, what is needed to Install on it so that I can Convert it into SMTP, with authentication.
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Postfix is an SMTP (Simple Mail Transfer Protocol) server. Look at this page to read more about SMTP protocol.
Your question can not be answered in its current form. You need to read a lot more about this topic and if you have any specific problem, we can help.