Hang in there.
All I have to do is log into my mail server and build a forwarder on the email address that I wish to be forwarded. It really is that simple.
Oh, you do not have an email server to build such a forwarder. We did not know that, as you have given us no information regarding the operating environment you are in.
What email program? Do you wish to always have your desktop on with your email program running in order for this action to take place?
There are mutliple right answers to this, but the BEST one for YOU depends on how and what you are using.
Please give us more information so that we can help you with a solution.
"If you can't soar with the eagles, then don't fly with the flock!" - Oliver Sykes; Bring Me The Horizon