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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
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I've been running a RH server since 7.1 and generally everything works out great, one of my HDs fried recently so I decided to reinstall with Fedora, I've gotten the server back up and running on all fronts except mail, its not quite working. First off, my firewall is blocking my SMTP port so I can't currently _receive_ mail from outside my server but I'm aware of this problem and will be fixing it shortly. What is stumping me is that I can't send mail to certain domains _from_ my server, it either times out or is refused:
Feb 6 10:27:46 domain sendmail: j15KvUHl013820: to=<email@example.com>, ctladdr=<user@domain> (500/500
), delay=21:30:16, xdelay=00:03:00, mailer=esmtp, pri=2011505, relay=gsmtp57.google.com. [18.104.22.168], dsn=4.0
.0, stat=Deferred: Connection timed out with gsmtp57.google.com.