The short answer

Use an alias when another address belongs to the same person and does not need a separate login. Use a shared inbox when two or more people need to see, assign, and answer the same customer conversations. Use a separate mailbox when the address needs its own access, records, retention, security boundary, or identity.

For a one-person business, start with one named mailbox and a few purposeful aliases. Upgrade support@ to a shared workflow when another person begins helping and duplicate or missed replies become a real risk.

Choose by workflow, not appearance

Ask five questions about each address:

1. Who needs to read the messages?
2. Who is allowed to reply?
3. Must replies appear to come from the role address?
4. Does the business need to know who handled each conversation?
5. Must the records remain separate from one person’s mail?

Then use this guide:

Do not create a separate paid mailbox merely because the address looks official. Do not use an alias when the business needs assignment, accountability, or a clean access handoff.

What an alias can and cannot do

An alias is another address connected to an existing mailbox. For example, messages to hello@brightnest.com may arrive in Marge’s marge@brightnest.com inbox.

An alias works well when:

• one person owns every conversation.
• no separate login is needed.
• the mail can be stored with that person’s other work.
• the provider lets the person reply with the correct From address.

Test the outgoing identity. Some forwarding arrangements receive mail at the alias but reply from the personal address, which can confuse the customer. Also decide what happens to the alias if the person leaves.

An alias does not automatically provide a shared queue, assignment, notes, status, reporting, or independent retention. If two people simply log into one person’s account or forward messages back and forth, the alias has outgrown its job.

What a shared inbox should solve

A proper shared workflow lets the team answer three questions at a glance:

• Is someone handling this?
• What has already been said?
• What still needs to happen?

Provider terminology differs. Google documents a Collaborative Inbox in Google Groups that can assign conversations and mark them complete or duplicate. Microsoft describes shared mailboxes as common addresses that approved members can monitor and send from, and warns that the shared mailbox account is not intended for direct sign-in.

Those products are not identical. Before choosing one, test:

• assignment and ownership.
• collision protection when two people reply.
• internal notes or comments.
• mobile access.
• search and history.
• reporting and response-time tracking.
• permissions and offboarding.
• what happens when a message is deleted.
• licensing and storage rules at your plan level.

For a small support operation, a lightweight help-desk tool may eventually be clearer than bending a normal mailbox into a ticket system. Add it when the volume and coordination problem justify the extra tool.

When a separate mailbox earns its cost

A separate mailbox is appropriate when:

• an employee needs an individual identity and calendar.
• access must be granted or removed independently.
• private financial, legal, personnel, or executive correspondence must stay separate.
• records need their own retention or export.
• an automated process requires a real mailbox, not an alias.
• the address may later be handed to a different role.

Do not share its password. Give each authorized person delegated access when the provider supports it, and keep an access record.

Build a tiny responsibility agreement

For every public role address, fill in this card:

Add three operating rules:

1. Assign before replying.
2. Leave an internal note when context is not visible in the thread.
3. Never mark a conversation complete merely because you sent a response.

That last rule matters. The job is not “email sent.” The job is “customer has a usable answer or knows exactly what happens next.”

Start small and promote the address when needed

Here is a sensible growth path:

1. hello@ begins as an alias into the owner’s mailbox.
2. The owner uses a label and a daily review time.
3. A helper joins, so the business moves the address to a shared queue.
4. The address gains assignment, response rules, templates, and reporting.
5. Higher volume or several channels justify a help desk.

Preserve the public address through those changes. Customers should not have to learn a new contact address every time the internal workflow matures.

Sources and further reading

• Google Workspace: Make a Google Group a Collaborative Inbox
• Microsoft: About shared mailboxes in Microsoft 365

If these addresses will support subscribers

The Email Marketing System can help you separate personal correspondence, customer service, transactional notices, and permission-based marketing email.

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