A postfix mail server (or sendmail) is not exactly a "component" of a mail system, but can in fact be the mail system. I personally prefer Postfix, but others still dig Sendmail. Both are robust and can handle virtually anything you throw at them. I use Postfix, with Spamassassin and Clam-AV for a nice mail server/virus scanner/spam killer. It works well and thankfully is stable enough not to need a gui-based admin program, although webmin works fine for all of the above programs.
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