Both let you receive email at more than one address, but they work differently and suit different needs.
Email Alias
An alias is an alternate address that delivers directly into an existing mailbox — no separate inbox to check, no additional storage used.
Additional Mailbox
A full mailbox has its own separate inbox, storage allocation, and login — appropriate when a different person or team genuinely needs to manage that address independently.
Choosing Between Them
Use an alias for something like info@ that should land in your existing inbox. Use a full mailbox when a different person needs to log in and manage that address's mail themselves.
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