What is a unified inbox?
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A unified inbox is a single list that shows incoming mail from several email accounts at once, without merging the accounts themselves. Each message stays attached to the account that received it, so replies go out from the right address.
A view, not a merge
This is the distinction that matters, and the one most people are actually asking about. A unified inbox does not combine your accounts into a single mailbox. Each account keeps its own address, password, settings, storage and spam filtering. What is combined is the display: one scrollable list, usually sorted newest first, with some marker showing which account each message came from.
Because the underlying accounts are untouched, the view is reversible. Turn it off, or stop using the app that provides it, and every account is exactly as it was.
How it differs from the alternatives
| What it does | Reply address | Reversible | |
|---|---|---|---|
| Unified inbox | Displays several accounts in one list | Correct automatically — the message knows its account | Yes. Accounts are untouched |
| Forwarding | Copies mail into one real mailbox | Wrong by default. Needs send-as per address | Yes, but forwarded copies remain |
| Account switching | Shows one account at a time | Correct, because you are in that account | Yes, nothing is changed |
The practical difference is the reply. Forwarding is the cheapest way to see everything in one place and the most reliable way to answer a client from your personal address by accident. A unified inbox keeps the association between a message and the account it arrived at, which is what makes replying safe.
What to check before choosing one
- Which providers it supports. Some tools handle any IMAP mailbox; some are tied to one provider. Check yours is covered before anything else.
- Whether it sends as well as reads. A few tools only aggregate incoming mail. If you answer from several addresses, that is half a solution.
- Where it holds your mail. A desktop client stores a local copy, which is what makes it work offline. A web app usually fetches on demand and stores little.
- How it authenticates. Anything asking for your email password directly, rather than sending you to your provider’s own consent screen, is worth refusing.
- How you revoke it. You should be able to withdraw access from your provider’s account settings, not only from inside the tool.
Common questions
Does a unified inbox merge my email accounts?
No. A unified inbox is a view, not a merge. Each account keeps its own address, password, settings and storage, and each message stays attached to the account that received it. Turning the unified view off leaves every account exactly as it was.
What is the difference between a unified inbox and forwarding?
Forwarding copies mail from several accounts into one real mailbox, so the receiving account becomes the sender on every reply. A unified inbox only displays the accounts together and keeps each message bound to its own account, so replies keep the correct address without extra configuration.
Does Gmail have a unified inbox?
Not on the web. Gmail’s account switcher shows one account at a time rather than a combined list. The Gmail mobile app offers an "All inboxes" view across accounts added to the app, but Gmail on the web has no equivalent.
Do I need a unified inbox?
You benefit from one if you reply from more than one address regularly. If you mostly read your secondary accounts and rarely answer from them, account switching or forwarding costs nothing and is enough.
An example
Postbox is a free web app that provides a unified inbox for Gmail specifically: connect several Gmail or Google Workspace accounts and read them in one list, replying from the address that received each message. It is one of several options — the comparison page covers the desktop clients too, and the guide to managing multiple Gmail accounts covers the free methods that need no extra software at all.
Postbox · Managing multiple Gmail accounts· Compare the apps·