SMTP Authentication prevents unauthorized user from sending out spam mails. But some applications do not support SMTP Authentication. Example of these are web applications with mail sending features (Microsoft Office Sharepoint Server, PHP based applications, etc).
One solution to this problem is to bypass SMTP authentication for certain IP addresses. This article will show you how to configure Postfix to allow outbound mail without requiring authentication for authorized IP addresses.
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Posted on 10/19/2008 and last updated on 11/6/2009
Filed under Postfix