MQ ReLinks is a wordpress plugin which allows you to easy make all external links in posts, pages, comments and author links non external, by using a redirect.
In stead of a direct link to another site, the plugin will create a link to a out.php file that will redirect to the requested URL. They can be opened in a new window or in the same one.
You can configure the post, comment and author link options in the administration area.
A redirected link will look like this:

http://maiq.info/wp-content/plugins/mqrelinks/out.php?url=http://www.wordpress.org/

You can edit it to look like this:

http://maiq.info/out/http://www.wordpress.org/

To do so you have to edit the .htaccess file and add a line of code:

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RewriteRule ^out/(.*)$ wp-content/plugins/mq-relinks/out.php?url=$1 [L]

right after this part of code:

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BEGIN WordPress
RewriteEngine On 
RewriteBase / 
RewriteRule ^index.php$ - [L]

There are further instructions in the administration area.

Usage:

1. Download, unzip, copy mqrelinks directory to your plugin folder.
2. Go to your wordpress admin panel, click on Plugins and activate MQ ReLinks.
3. Go to Options>MQ ReLinks and configure the plugin.
   1. Select your desired configuration.
   2. Edit the .htaccess file (if needed)
4. Click Update.

Requires:

• WordPress: 2.3 or higher

Compatible up to:

• WordPress: 3.3.1

Release info:

• Date: April 28th, 2008
• Version: 1.0
• Date: May 28th, 2009
• Version: 1.1
• Date: July 28th, 2010
• Version: 1.2
• Date: March 19th, 2012
• Version: 1.3

Download:

• MQ ReLinks

Installation:

1. Unzip the downloaded package and upload the MQ ReLinks folder into your WordPress plugins folder
2. Log into your WordPress admin panel
3. Go to Plugins and “Activate” the plugin. “MQ ReLinks” will now be displayed in your Options section
4. Configure the plugin under Options -> MQ ReLinks