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<p><FONT class=normalfont><B><font color=blue>Howto smtp auth with Postfix</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：作者<br>来自：Linux知识宝库<br>联系方式：无名<br><br>Howto smtp auth with Postfix(1)<br>
<br>
Introduction<br>
What's the problem?<br>
<br>
If you want to relay messages from everywhere in the world using only one (your) smtp server you usually run into trouble. The servers relay permissions check your IP if it belongs to a trusted network (e.g. a range of IP Adresses). From the smtp servers point of view you try to send from an untrusted network when you dial-up.<br>
<br>
This HOWTO will help you deploy a method that is called smtp auth in conjunction with Postfix. It will explain installation, configuration and use of the softwares needed (Cyrus-SASL, TLS and Postfix) for this solution. Before you decide on using this method, read if you can do with less.<br>
What are the approaches to fix this issue?<br>
Add ip manually<br>
<br>
Each time a user wants to relay from an IP Adress unknown to the system, she adds the IP to the relay net, restarts the smtp server and sends her mail. After messaging is done she removes the IP and restarts the smtp server once more.<br>
This is by far the most insecure solution. Though possible, you would have to permit shell access to users and teach them how to deal with the system. It won't work for those who focus on the computing and not the computer...<br>
smtp-after-pop (pop-before-smtp)<br>
<br>
A service/script runs on the smtp server that will add IPs of users that have successfully authenticated to their pop3 or imap server. The service/script will write the IP of those users to a file or database. Since they are valid users to the pop/imap server they must also be valid users to the smtp server. When they send messages after the pop/imap the smtp server also looks up the file or database that the pop/imap server has written to and if the IP is found in there the client may relay messages. After a certain period the IP expires and is removed from the file/database.<br>
This will not work easily with common Mailclients, as not all of them come with built-in support for smtp-after-pop. There are workrounds on the net, but solution may require expensive configuration and/or constant support.<br>
smtp auth<br>
<br>
This approach uses a totally different, IP independend method. Instead of checking the IP of the Mailclient and comparing it to a range of permitted IP Adresses, the Mailclient authenticates itself providing username and password to the mailserver (or sharing a secret with it). These credentials are compared to a source that the mailserver has access to and if valid data has been provided, the mailserver will permit relaying.<br>
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