Email aliasing is a system by which you can set up a "catch-all" Email account, so that Email sent to any address at your domain will be sent to a single account. That means that whatever someone puts in front of the "@" symbol will not matter - as long as what comes after the "@" is your domain name, the message will arrive at the specified box - either a POP account or forwarded to your ISP's dial-up account. This service is available for a modest fee. This is sometimes called "unlimited aliasing".