The complete guide

What is a shared inbox?

The definition, the look-alikes it gets confused with, what Gmail and Outlook give you free — and the honest point where a team needs more.

Definition

A shared inbox is a single email address — like support@ or hello@ — that a whole team reads and answers together from one place, without sharing a password. Each message can be assigned to one owner, discussed privately, and tracked to done, so nothing is answered twice or missed entirely.

Looping animation: mail lands in the shared inbox, a teammate picks one up, and it is handled.

That's the whole idea. The complications — and the reason this guide exists — come from the fact that three very different things get called “shared inbox,” and the free ones quietly lack the features that make sharing an inbox safe.

The look-alikes

Shared inbox vs shared mailbox vs distribution list

These three get used interchangeably and behave nothing alike. The difference that matters: a distribution list copies mail out to individuals; a shared mailbox gives everyone the same pile; a shared inbox keeps one thread that one person visibly owns.

Distribution listShared mailboxShared inbox
What it actually isa forwarding ruleone mailbox, many loginsa team workspace
Where replies liveeach person’s inboxone pile, no ownerone thread, one owner
Who owns a messagenobodynobody
Can two people double-replyconstantlyeasilyit warns you first
Private team discussion——
History when someone leavesleaves with themstays, unownedstays, reassigned
The mechanics

How a shared inbox actually works

Underneath every real shared inbox tool are four mechanics. If a product is missing one of these, it's a mailbox with extra steps:

Assignment

Every conversation gets exactly one owner. “Someone will get it” becomes “Maya has it” — and the difference is the whole product.

Internal notes

The team discusses a tricky reply inside the thread, invisible to the customer, instead of forwarding fragments around.

Collision detection

When two people open the same conversation, both see it — before the customer receives two different answers.

Statuses that end

Open, waiting, done. A thread can be snoozed to a date or closed with confidence, so the inbox trends toward empty instead of toward panic.

The free routes

What Gmail and Outlook give you free — and what's missing

Both suites include a free route, and for a two-person team just starting out, either can genuinely be enough. Google's is Collaborative Inbox, bolted onto Google Groups; Microsoft's is the shared mailbox in Outlook. Honest credit where due: they cost nothing, live where your mail already lives, and take an afternoon to set up.

The gaps only show up once volume does. Neither has collision detection — the double-reply problem is yours to police by shouting across the room. Assignment in Collaborative Inbox is a label with no notification and no accountability; in an Outlook shared mailbox it doesn't exist at all. There's no round-robin, no SLA timer, no analytics on what your team answered or how fast, no internal notes on a thread, and search degrades badly as the pile grows. Microsoft also caps the mailbox at 50 GB and cuts off automatic replies in ways that surprise teams later.

Gmail Collaborative InboxOutlook shared mailboxShared inbox tool
The eight capabilities that decide it
Pricefreefree with M365paid
Real assignment with accountabilitylabels only—
Collision detection——
Internal notes on the thread——
Round-robin / load routing——
SLA timers & business hours——on better tools
Reporting & analytics——on better tools
Beyond email (chat, DMs)——

Platform capabilities as of August 2026.

The trigger signs

When a team needs one

Not at a headcount — at a set of symptoms. The trigger signs, from teams who made the switch:

  • A customer got two different answers to one question — or none, because everyone assumed someone else had it.
  • “Did anyone reply to that?” is a daily Slack message.
  • Support arrives on more than one channel — email plus Instagram, plus a chat widget — and each lives in a different app.
  • Someone left, and their password was the only key to a year of customer history.
  • The founder still reads every message — at midnight, resentfully.

Two or three of those and the free routes are already costing more than a tool would.

The three routes

How to set one up: the three routes

Route 1 — Google, free

Create a Google Group for support@, enable Collaborative Inbox in the group's settings, add your team as members with the “manage” role. Mail to the address lands in the group; members can assign-by-label and mark complete. Fine for two people at low volume; the gaps above apply.

Route 2 — Microsoft, free with 365

In the admin centre, create a shared mailbox and grant your team Full Access and Send As. It appears in everyone's Outlook. You get one shared pile and a shared sent folder — workable for coverage, blind on ownership.

Route 3 — a dedicated tool

Connect your existing address (Gmail, Outlook or plain IMAP) to a shared inbox product. Mail keeps flowing through your provider; the tool adds the ownership layer — assignment, notes, collision detection, statuses — and usually the other channels too. Setup is minutes, not a migration: your address, your history, a new front end for the team.

The buying criteria

What to look for in a tool

Buying criteria that hold up regardless of which product you pick:

  • The four mechanics above, non-negotiable — especially collision detection.
  • Every channel you actually use in one queue — check email and live chat minimum, and be suspicious of “coming soon” lists.
  • AI with a leash you control. Drafting help is a gift; auto-sending is a policy decision. Know which one you're buying — our position is that a human approves every send.
  • Pricing that survives growth. Per-seat bills double when the team does; per-ticket bills spike exactly when you're busiest. Flat pricing is the only shape that doesn't punish success.
  • An exit. Full export of conversations and customers, any time, no call required.

That last honest note is also the product section of this guide: inrelay is a shared inbox built AI-native — the agent reads, tags and drafts, your team approves — sold flat, with teammates never priced on the Team plan. If the symptoms above sound familiar, it takes minutes to try with your own inbox.

Start today

Try it with your own inbox.

Connect your existing support@ in minutes — nothing migrates, everything calms down.

Start freeSee pricing

Common questions.

What is a shared inbox in plain terms?
One email address a whole team answers together, with each conversation assigned to one visible owner — instead of a password passed around or copies forwarded to everyone.
Is a shared inbox the same as a shared mailbox?
No. A shared mailbox gives several people the same unstructured pile of mail. A shared inbox adds ownership: assignment, internal notes, collision warnings and statuses.
Can I make a shared inbox in Gmail for free?
Yes — Google Groups' Collaborative Inbox, set up in about an afternoon. It works at low volume but has no collision detection, no notes, no real accountability, which is where teams outgrow it.
Do shared inbox tools replace my email provider?
No — they connect to your existing Gmail, Outlook or IMAP address. Mail keeps flowing through your provider; the tool is the team's front end on top of it.
What does a shared inbox cost?
Most tools charge $12–$115 per person per month, which climbs as you hire. Flat-priced tools charge per plan instead — inrelay runs $19/month for one person, $79/month flat for a whole team (teammates are never priced) and $149+/month per bundle of client workspaces, with a free tier, as of August 2026.

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