Sendmail without the Superuser
usenix.org
As an exercise in the application of the concept of least privilege, we have modified the pieces of an ordinary UNIX* mail system, sendmail in particular, to require little or no privilege in their operation.
Setting up sendmail on a firewall, Part 1
wkeys.com
This article discusses the implementation of sendmail on the firewall and focuses on features new to sendmail 8.9.3.
Sendmail Security
coker.com.au
This page briefly describes how to setup sendmail to run without ever having root security
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