"'Neither rain, nor sleet, nor snow...' SMTP (Simple Mail
Transfer Protocol) gateways are the ubiquitous workhorses of the
Internet today. People expect e-mail to be reliable and quick, so
SMTP gateways always have to be highly available and work under a
heavy-duty cycle. And now with the growing crush of spam showing no
signs of abating, SMTP gateways are asked to be secure, as well as
perform a host of other functions beyond basic 'store-and-forward'
"Using Linux as the platform for this part of your network
infrastructure makes good sense. The Linux kernel and file system
can run unattended for years. Linux can easily be locked down to
serve this single purpose, and because the tradition of SMTP mail
is deeply-rooted in open systems, there are several freely
available, high-quality MTA (mail transfer agents) available for
your Linux boxes..."
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