domain fowarding url's

Hello, I am wondering if I should submit my (domain fowarding url's) redirect sites to all the search engines to my main website.
I heard that search engines penalize you for this, especially google...
Please help...
Thanks...

forwarding url's? do you mean gateway pages? or just domains that are pointing to your real one?

for the domains, use a 301 Permanent Redirect.

if you have htaccess, drop this into it:

just domains pointing to my real website... Should i submit all six of them to search engines?

If you have several domains pointing to the same site purely on the reasoning that 2 domains each displaying identical content == twice as much content (an argument that is flawed in oh so many ways), then you will be penalized by search engines.

Just concentrate on your primary domain. If you have other domains that you wish to forward to this domain, then use a 301 redirect, and forget about them.

I need to know where to place this 301 rule? I have 3 other url's that are fowarded to my main url and wondering how to place this. On my main website page and do i seperate them. Any more help is very much appreciated. New to this...

I would not forward any URLs to your main domain.

I had several urls forwarded to my site ( not knowing it would cause a problem). It has caused me problems with Google and Yahoo.

We removed the forwarding and notified both SE's. Now, we are doing fine with Google and still waiting for a review from Yahoo.