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Configure sendmail to accept emails only if “from", “to" or specific field matches
you can exclude an email address or even a host that is spamming you using the access file located in your etc directory, the bad news is that it does not support regex or even wildcards.
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install / compile MYSQL 5 on RHEL / CentOS 4
There not much performance difference between MYSQL 4 and 5 as far as you're not using mysqli ext for your PHP scripts, but it nice to find rpms ready on Centos.org which makes the job much easier.
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