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I built my own custom form which is inside a Contact folder with the 755 permission. Since my email address is inside the contact.php should I change the permission to 700?
No, all of your folders should be set to 755 and files should be set to 644.
With Joomla, the only file that should ever need to be different (optional) is your configuration.php file which can be set to 444
Required, but never shown