Free account doesn't have domain aliases. Does that mean I can't use personal@my-domain.org and work@my-domain.org all pointing to one inbox?

Since they allow 10 users with each 5gb inbox that means I have 10 different inboxes that can be personal@my-domain.org or work@my-domain.org or mailing-list@my-domain.org.

No custom url? Does that mean no custom domain allowed?