After previously bashing my brains against setting up an external SMTP server, I did my best to shirk the work on somebody else. That of course, is not one of my strong points, so it landed squarely back in my lap. I am wary of any tool whose configuration requires other tools, as sendmail certainly does. I also love a quote I ran across on some mail list: "Nicht ein Kernal Panik? Nicht ein Core dump? Est sendmail". Now I don't speak German, so forgive my paraphrasing, but you get the point.
Anyway, hats off to Joey, with his simple instructions about a RHEL 5 SMTP server in Linux Gazette.
Here are a few things that might help. Before you get started with Joey's instructions, run
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sudo yum install sendmail-cf
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export PATH="$PATH:/sbin:/usr/sbin"
Additionally, the auth system goes off your linux users, so just add a user and give it a password if you want to authenticate.
