auth smtp and pam.d

[m.w.chang]

I am using the latest version (8.12.6) of sendmail, but owning to 
directory persmission problem, i didn't set it up to start as smmsh. 
thank you for your reminder.

> If you're still running sendmail as root then you have an older version of
> sendmail.  The newer ones have changed this to a non root user for
> security reasons.  If a hacker is able to cause a buffer overflow on a
> root owned process and take over then they're now running as
> root...obviously not a good thing!

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