Have you ever think about sharing one website with two domain without redirecting ?
for example domain1.com is your main site and you want to access the site using domain2.com without redirecting to domain1.com.
Here we are listing few simple steps to share multiple domain with one website.
1 – Go to your second domain control panel (say domain2.com) and update name server with first domain (domain1.com)
2 – Go to cpanel and click parked domain (in plesk it is called Domain Aliases)
3 -Add domain2.com in parked domain.

After finish the above steps you can use domain2.com to access domain1.com site.
Note : you must add cononical url to avoid the search engine indexing issue. To know more read this articles
http://googlewebmastercentral.blogspot.com/2009/02/specify-your-canonical.html