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How to check for an open relay
To see if yourserver.com is an open relay, you can run through the following sequence on any box that has a telnet client:
telnet yourserver.com 25
HELO myserver.ca
MAIL FROM:
RCPT TO:
DATA
From: "Relay Test"
To: Mike
Subject: Open Relay Test
This is a relay test. A properly configured mail server
should decline to relay this message.
.
QUIT
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Included below are some commands that I have found, created or tweaked to help make life easier along the way.
Getting SELinux working can be tough. Here are some commands I found useful.
Is SELinux enabled?
Deactivate all inactive users in the last year:
Yes, some distros still use rpm.
Extract files from an RPM:
Get into the correct directory:
cd /etc/pki/tls/certs