I use Zoho for exactly this purpose. It's free for small teams (under 5 or 10 users), and they don't count "group" email addresses against your total. With "g

I use Zoho for exactly this purpose. It's free for small teams (under 5 or 10 users), and they don't count "group" email addresses against your total. With "group" email addresses, you can create as many as you like, then choose the real accounts that can send.receive emails from that address.