Best Shared Inbox Software for Agencies
A shared inbox lets several people read and answer email sent to one address, such as hello@ or a client-specific alias. This guide focuses on the inbox mechanics: who owns a message, who can see it, and how the team coordinates around it.
Find My Software StackWhy a shared inbox is a separate decision
Agencies often start with one person forwarding client emails to colleagues. That works until the person is away, or until two people reply to the same message. A shared inbox makes the thread visible to the whole team and shows whether someone has picked it up.
This page is narrower than agency client communication software, which also covers how conversations with clients are organized overall. It also differs from a help desk, which adds ticket structure, and from client request management, which tracks requests during delivery.
What to look for in a shared inbox
Assignment and status
Someone should be able to mark a conversation as theirs and close it when handled, so the team can filter for what is still open.
Internal discussion on the thread
Notes or comments that stay invisible to the client keep questions like “what did we promise last month?” attached to the email itself.
Where your email already lives
Tools built on top of Gmail or Outlook change less about how the team works than tools that replace the inbox with a separate app.
Weight of the tool
Several products in this space are full customer service platforms. A small agency may only need assignment, notes and a shared view.
Software worth evaluating
The list starts with two options many agencies already pay for through their email provider, then moves to dedicated tools.
Google Groups Collaborative Inbox
Best suited for: Agencies on Google Workspace that want assignment without another subscription
Strengths: Google’s help documentation describes assigning a conversation to a group member, adding a note to the assignment email, and marking conversations complete, no action needed or duplicate.
A limitation is: Limited to Google Workspace and to the features Google Groups provides
Microsoft 365 shared mailbox
Best suited for: Agencies on Microsoft 365 that want one address handled by several people
Strengths: Microsoft describes it as a way for multiple users to share responsibility for reading and answering email sent to one address, with Full Access and Send As or Send on Behalf permissions.
A limitation is: Managed through admin permissions, and the documentation covers shared access rather than assignment workflows
Missive
Best suited for: Teams that want a shared inbox and internal chat in the same app
Strengths: Lets teams discuss an email inside that email, give each team a shared inbox and shared tasks, and turn an email into a task.
A limitation is: Replaces or sits beside your existing mail app, which the team has to adopt
Front
Best suited for: Email-centric client relationships handled by several people
Strengths: Offers collaborative shared inboxes with comments on emails so teams can discuss and escalate without leaving the thread.
A limitation is: Positioned as a broader customer service platform, which can exceed a small agency’s needs
Hiver
Best suited for: Teams that want to keep working inside Gmail
Strengths: Comes in two forms: Hiver in Gmail, which runs inside your inbox, and Hiver Omni, a separate web platform that works with any email provider.
A limitation is: Its current focus is customer support, so agency-specific features are not the emphasis
Help Scout
Best suited for: Small teams that want a support-style shared inbox
Strengths: Its inbox brings email, SMS, social, chat and voice into one place, with assignments that can happen automatically and workflows to keep things organized.
A limitation is: Support-desk structure may feel heavy for ongoing, relationship-style client email
Quick comparison
| Software | Best suited for | Key capabilities | Important limitation |
|---|---|---|---|
| Google Groups Collaborative Inbox | Agencies on Google Workspace that want assignment without another subscription | Assignment, resolution status, Workspace-based | Limited to Google Workspace and to the features Google Groups provides |
| Microsoft 365 shared mailbox | Agencies on Microsoft 365 that want one address handled by several people | Shared address, delegated permissions, Outlook access | Managed through admin permissions, and the documentation covers shared access rather than assignment workflows |
| Missive | Teams that want a shared inbox and internal chat in the same app | Shared inbox, internal discussion, tasks, automations | Replaces or sits beside your existing mail app, which the team has to adopt |
| Front | Email-centric client relationships handled by several people | Shared inboxes, email comments, automation | Positioned as a broader customer service platform, which can exceed a small agency’s needs |
| Hiver | Teams that want to keep working inside Gmail | Gmail-based shared inbox, internal notes, ticketing | Its current focus is customer support, so agency-specific features are not the emphasis |
| Help Scout | Small teams that want a support-style shared inbox | Shared inbox, automatic assignment, workflows | Support-desk structure may feel heavy for ongoing, relationship-style client email |
Summaries reflect each vendor’s public website as reviewed in September 2026. Plans, limits and pricing change, so confirm current details with the vendor before deciding.
How to choose
Begin with your email provider. If the team is on Google Workspace or Microsoft 365, the built-in options show what you can do with no new tool. If you outgrow them because you need assignment, notes or a clear open-versus-done view, move to a dedicated inbox.
Then decide how much structure you want. Relationship-style client email suits an inbox with notes and assignment. Discrete requests that must be resolved and closed suit a help desk. Whichever you choose, keep it consistent with your client communication approach so clients know where to write.
Common mistakes
Sharing one login to a personal inbox
Sharing a password removes the audit trail and makes it unclear who replied. Use a real shared mailbox or a dedicated tool instead.
No rule for who replies
A shared inbox without an owner rule leads to messages that everyone can see and nobody answers.
Mixing internal chatter into client replies
Use notes or comments for internal discussion so nothing internal is sent to the client by accident.
Adopting a full support platform too early
More features mean more setup. Start with what the team will actually use, then add structure.
Frequently asked questions
Is a shared inbox the same as a group email address?
Not quite. A plain distribution list forwards mail to several people. A shared inbox keeps one copy of the thread that everyone can open, and usually shows who is handling it.
Can clients see internal notes?
Internal notes and comments are designed to stay inside the team. Check each tool’s documentation and test with a colleague before relying on it.
Do we need a shared inbox if we have a help desk?
A help desk usually includes a shared inbox. The reverse is not always true, so choose based on whether you need tickets, statuses and possible response-time targets.
Where does this fit with the rest of the stack?
It sits in front of delivery work. Requests that need action should move into your project tool; see client request management.
Conclusion
A shared inbox is a low-cost way to stop client email from depending on one person. Start with the tools your email provider already includes, and move to a dedicated inbox when assignment, notes and clear ownership become daily needs.
Place the inbox in your wider stack
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