There are several tricks out there that allow you to increase the number of unique email addresses available with your GMail email account. Here's another. In addition to your address at the gmail.com domain, you can also use the googlemail.com domain. So if your Gmail address is myname@gmail.com you can also use myname@googlemail.com and the mail will end up in your GMail inbox. You can also look at mail details and set up filters based on this address. So you can use this additional domain and treat those emails differently if you want.