In that instance you can. What is also nice though is if you have a custom domain, you can set the custom domain to do the same thing AND have an alias.

So for me, I have a few emails in my custom domain:

{firstname}@example.com

market@example.com

(there's others, but it's not relavent to this discussion).

market@example.com just goes straight to spam, as I don't use that email for anything. foo@market.example.com is used for each email instance. It works out extremely well.