Redirects visitors to the the site’s URL as it appears in the WordPress database in case they’re not already connecting through that domain. This is handy for secondary domains that point to your WordPress site.
For example, if example.com and example.net both point to your server, WordPress will normally serve the same site regardless of what the user types in their address bar. 
With this plugin enabled, users visiting the secondary domain will be automatically redirected to whichever domain is configured as the “Site Address (URL)” under WordPress’ “General Settings” page.

Multidomain Redirect

Redirects visitors to the the site's URL as it appears in the WordPress database in case they're not already connecting through that domain.

vanMeerdervoort

Redirects users to specific URL based on the domain name they used to enter the website. My band’s name (Harmony Glen) ends with one N, while many people type it with two (Harmony Glenn). I registered that faulty domain and made sure that when someone entered the wrong name, they got redirected to the right domain and a page that explains how to spell the name correctly.
Perhaps this plugin is of some use for you. I intend to add the option to enter more domain names, currently it supports only one redirect.
<h3>Usage</h3>
Go to the settings page and enter the url you want to redirect to another url, including http:// or https:// 
Make sure you enter the exact URL you want to redirect!

Domain Redirect

Redirect users to specific URL based on the domain name they used to enter your website.

Multidomain Redirect vs Domain Redirect