Magento – File does not exist:/var/www/skin, /var/www/js, /var/www/media

FTPing or copying and pasting innodb tables from one filesystem to another isn't going to work. Try this to restore innodb tables:

[http://egil.biz/how-to-recover-mysql-data-from-innodb/][1]

Better yet, do nightly dumps of your magento database:

mysqldump -u david -h localhost -pmypassword mymagentodatabase > mymagentodatabase.sql | gzip mymagentodatabase.sql 

To restore, open up mysql on the command line:

use mymagentodatabase
source /home/david/mymagentodatabase.sql 

Restoring from the mysql command line is way faster than using a client like navicat or phpmyadmin.

In my work environment, I also have a clone of the production code base on my development machine, such as: http://dev.magentowebsite.com. When I have to, I restore the last dump to my local mysql, then go into core_config_data and change the secure and nonsecure urls to http://dev.magentowebsite.com. Then I have the live site on my local machine and can test things without breaking the live site.

Just dig.

Your Exception is thrown here: app/code/core/Mage/Contacts/controllers/IndexController.php:107

therefore $mailTemplate->getSentSuccess() must be false

It is set false here: app/code/core/Mage/Core/Model/Email/Template.php:479

but the mail is going out, so this code is executed and send() returns false:

app/code/core/Mage/Core/Model/Email/Template.php:506
$this->setSentSuccess($this->send($email, $name, $vars));

this means, this code is executed:

app/code/core/Mage/Core/Model/Email/Template.php:453
    try {
        $mail->send();
        $this->_mail = null;
    }
    catch (Exception $e) {
        $this->_mail = null;
        Mage::logException($e);
        return false;
    }

Most likely Zend_Mail_Transport_Sendmail is used, so it continues here:

\Zend_Mail_Transport_Sendmail::_sendMail

What ever happens there, I would think throw new Zend_Mail_Transport_Exception('Unable to send mail. ' . $this->_errstr); is thrown.

This means for me, you should add some logging here \Zend_Mail_Transport_Sendmail::_handleMailErrors ,because of the catched and newly thrown Exception (app/code/core/Mage/Core/Model/Email/Template.php:453) all the errors descriptions are gone.

But the error should be logged in exception.log. Did you check it? If not, read this: Fundamentals of debugging Magento