Shared mailbox vs distribution list
Also known as: shared mailbox, distribution list, distribution group, group email
A shared mailbox is a single inbox (like info@ or support@) that several staff can open, read, and reply from as the shared address.
A distribution list is a single address that simply forwards each message to a group of individual inboxes. Choosing correctly keeps team communication organized and avoids duplicated or missed replies.
Shared mailbox vs distribution list, explained at three levels
At home
A shared mailbox is like a shared front desk: one inbox that several people sit at, where everyone sees the same letters and whoever answers signs as the business. A distribution list is like a photocopier: one address that makes a copy of each email and drops it into every member's own inbox. One gives a team a single shared workspace; the other just spreads a message out to many people.
At work
A shared mailbox is a single inbox, such as info@ or billing@, that several staff open and reply from as that address, with one shared history. A distribution list is one address, such as all-staff@, that forwards each incoming message to every member's personal inbox. Businesses use shared mailboxes for handling customer mail together, and distribution lists for announcements to a group.
At home
The difference shows up when someone replies. In a shared mailbox, the reply goes out from support@, sits in the shared Sent Items, and everyone can see the question has been answered. On a distribution list, each member has a private copy, so a reply comes from that person's own address and nobody else knows it was sent. That is why two people can answer the same customer twice, or nobody answers at all.
At work
In Microsoft 365, a shared mailbox is a real mailbox with no password of its own; staff reach it through permissions, and it needs no paid licence up to 50 GB. A distribution list is just an address with a member list. Microsoft 365 Groups sit between the two: a group address plus a shared inbox, calendar, and SharePoint site. Busy customer-facing teams often move on to a helpdesk tool that assigns and tracks each message.
At home
Shared mailboxes run on three permissions. Full Access lets someone open the mailbox. Send As lets them send so the message appears to come from the shared address. Send on Behalf shows both names, such as 'Lena on behalf of Info'. Distribution lists can be static, with a fixed member list, or dynamic, with members chosen by a rule such as department. In my view, the shared mailbox is the better default for any address customers write to.
At work
At scale, shared mailboxes lack assignment, status tracking, and response-time targets, so two agents can open the same message and nobody owns it. That is the point to adopt a ticketing system. Distribution lists need governance: who may join, whether outside senders are allowed, and moderation for large lists. Choosing between a distribution list and a Microsoft 365 Group decides whether the team also gets a shared calendar, files, and a Teams space.
Real-world examples
At home
Lena set up info@ as a shared mailbox so both she and her assistant could see and answer customer inquiries from one place, replying as 'info@' and always knowing which messages were already handled. No more forwarding emails back and forth.
At work
Carlos's firm used a distribution list for 'all-staff@' announcements and shared mailboxes for sales@ and support@. The distribution list broadcast company news to everyone's inbox, while the shared mailboxes let small teams collaboratively manage customer conversations with a single record.
How it compares
| feature | Shared mailbox | Distribution list |
|---|---|---|
| How mail is handled | One common inbox | Forwarded to each member |
| Replies sent as | The shared address | The individual |
| Shared history | Yes, centralized | No |
| Best for | Team handling incoming mail | Broadcasting to a group |
| Sees who replied | Yes | No |
For analysts
Match the tool to the workflow: shared mailboxes for teams jointly handling incoming customer email, distribution lists for one-to-many announcements. If a shared mailbox gets busy enough that replies collide or get missed, that's the signal to consider a helpdesk ticketing system.
History & origin
As businesses adopted role-based addresses like sales@ and support@, two approaches emerged: forwarding mail to everyone in a group (distribution lists) or providing a common inbox everyone works from (shared mailboxes). Email platforms refined both, and shared mailboxes gained popularity for team-based handling of customer email because they keep a single, coordinated record of conversations rather than scattering copies across personal inboxes.