Email Forwarding is done at the server level and is transparent to the sender and the recipient of the email. For example, a person sends a message to you@your-website.com. It is instantly and transparently forwarded to you@your-ISP.com. You receive it and reply to it as you would any email, despite the fact that it has been forwarded. You configure your mail client to use you@your-website.com as your "Reply-To:" address and the recipient is unaware of the email address provided by your Internet Service Provider (ISP).Your email can be forwarded to any ISP (e.g., AOL, Earthlink, Pacbell, Comcast, Cox) as well as any free email services (Hotmail, Yahoo, Juno) and can be collected/read by any email client (Eudora, Outlook, Outlook Express, Netscape, etc.)
You can have up to five email accounts with your domain name, provided you have corresponding accounts to receive them. For example, everything sent to "your-website.com" can be forwarded to a single ISP account, or each message can be forwarded to a different email address (anything before the "@" symbol) at "your-ISP.com.