[ilugd]: Postfix - SMTP-AUTH

[Amit Goel]

Dear Linuxers   I have set up postfix to server emails within our organization. Now the problem is that anyone internal, can send email using any sender's email address, if he can telnet 25. This has created problem with people changin their sender email address and sending fake emails. I want to identify who sent the email by examining logs of postfix, ideally ipadress lookup will do but some smart people also come over that. So I want postfix to ask for username and password before accepting any outbound email (local or smtp or any transport). How do I do that. I found few pointers, specially at SuSE but they mentioned using Postfix server as SMTP-AUTH client for other servers like your relay server at your ISP.   Thanks in Advance   Amit