Every address, one list
Combine Email Accounts: Merge Every Mailbox Into One Combined Inbox
Connect Gmail, Outlook, iCloud, Yahoo, and any mail on your own domain over IMAP, and read all of it in one place. Every account stays separate underneath, so replies leave from the right address, and an AI model reads each message on arrival to categorize it and flag spam.
Nothing migrated · Any IMAP provider · Two-way sync
In short
To combine email accounts, you either merge them (forward everything into one provider, which physically moves your mail) or you connect them to one client that reads all of them at once and leaves each account where it is. The second approach is almost always the better one: nothing is migrated, replies still leave from the correct address, and you can walk away from the tool without unpicking years of forwarding rules. Inboxes takes that approach in the browser. Connect each mailbox over IMAP, and every account lands on one combined board where an AI model gives each message a category (work, personal, receipts, newsletters, notifications) and flags spam before you read it.
Last updated July 2026
Combines accounts from
The distinction that decides everything
Merging accounts and combining accounts are not the same thing
People search for both with the same words. They have very different consequences, and only one of them is reversible.
// Merging
The mail physically moves
You set your other addresses to forward into one account. From then on, that one provider holds everything. It is free and it is built into Gmail and Outlook, which is why most people try it first. It also flattens your identities into one pile, breaks reply addresses unless you configure send-as for every address, and is genuinely painful to unwind two years later when you want the accounts apart again.
// Combining
The mail stays where it lives
You connect each account to a client over IMAP and the client shows them together. Gmail stays Gmail, your work domain stays on your work server, and the combined view is a lens over both. Disconnect the tool tomorrow and every mailbox is exactly as it was. This is what a unified inbox does, and it is the approach worth paying for.
Compare the options
The four ways people combine email accounts
Each one solves a slightly different problem. Here is what each actually gives you, without the marketing.
| What you get | Forward everything to one account | Phone Mail app (All Inboxes) | Desktop client (Thunderbird, Mailbird) | Browser unified inbox (Inboxes) |
|---|---|---|---|---|
| Accounts stay separate | No, merged into one | Yes | Yes | Yes |
| Replies leave from the right address | Only with send-as set up per address | Yes | Yes | Yes |
| Works on any machine, nothing installed | Webmail only | That phone only | Tied to the installed machine | Yes |
| Sorts the mail as it arrives | No | No | Manual filters and rules | AI categorizes every message |
| One search across every account | Yes, one mailbox | Yes | Yes | Yes |
| Reversible without losing anything | Hard to unwind later | Yes | Yes | Yes, mail never moves |
| Cost | No cost | Included with the phone | No cost to about $5/mo | From $29/mo flat |
If your only goal is to stop logging in four times, the phone Mail app and a desktop client both do it and cost little or nothing. Paying makes sense when the volume across those accounts is the actual problem and you need the pile sorted before you look at it.
Provider by provider
How to combine email accounts in Gmail, Outlook, iPhone, and Thunderbird
What each provider genuinely supports today, and where each one stops.
Gmail
Gmail on the web will not show two Google accounts in one inbox. Settings, then Accounts and Import, lets you pull another address in and send as it, but that merges the mail into one mailbox rather than combining two. Google is also retiring the POP-based version of "check mail from other accounts" and Gmailify, closing to new users after early 2026 with existing users supported into January 2027. IMAP is explicitly unaffected. The multiple-inboxes layout is a panel view of one account, not a way to add a second one.
Outlook
Desktop Outlook holds any number of accounts, each as its own mailbox tree, and there is no combined inbox button. The workaround is a search folder scoped to all mailboxes, which produces a single unread list you can live in. Outlook on the web only ever shows the account you signed in with, so a browser-based Outlook user has no combined view at all without a third-party client. Microsoft has an All Accounts view slated for the new Outlook during 2026, which would close this gap for Outlook-only users, though it will still cover only the accounts Outlook itself can hold.
iPhone and iPad
Apple Mail is the one place this works with no effort. Add the accounts in Settings, open Mail, tap Mailboxes, tap Edit, and enable All Inboxes. Every account appears in one list immediately. The catch is scope: that combined view exists on the device, so your laptop, your work machine, and any browser still show four separate accounts.
Thunderbird
Thunderbird has done this properly for years with Unified Folders, which stacks the inboxes of every connected account into one. It is free, open source, and runs on Windows, Mac, and Linux. It is also a desktop install with no shipped AI triage, so the sorting stays manual and the setup stays on whichever machines you installed it on.
Before you forward anything
What breaks when you merge accounts instead of combining them
Reply addresses go wrong quietly. Forwarded mail arrives in your main account, and unless you have added every original address as a verified send-as identity, your reply goes out from the wrong one. Clients notice. So do the spam filters on the other end, which sometimes flag a reply whose sending domain does not match the thread.
Filters and labels do not come with it. Years of rules you built in the old account stay in the old account. The forwarded mail lands in your main inbox as a raw stream and you rebuild everything from scratch.
Spam scoring changes. A forwarded message arrives with your own server in the chain, which can weaken the authentication signals the receiving provider checks. Legitimate mail forwarded from a second account is more likely to end up in spam than the same mail delivered directly.
You cannot cleanly undo it. Two years of mail is now interleaved in one mailbox with no reliable marker for which account it was originally sent to. Splitting it back apart is a manual project, and most people simply never do it.
None of that happens when you combine accounts with a client. Each mailbox keeps its own mail, its own filters, and its own identity, and the combined view sits on top. That is the whole argument for a unified inbox over a forwarding rule.
What Inboxes adds
Combine the accounts, then have the pile sorted for you
Putting four inboxes into one list is the easy half. Four inboxes worth of mail in one list is still four inboxes worth of mail.
Any number of IMAP accounts
Gmail, Outlook, iCloud, Yahoo, GMX, Zoho, and mail on your own domain. Each message on the board is labeled with the account it arrived at, so your identities never blur.
AI categories on arrival
Work, personal, receipts, newsletters, notifications, assigned from what the message actually says, across every combined account at once. No folder tree, no rules to maintain.
Spam your providers missed
Junk and phishing are flagged on content, catching what slips past a filter tuned for global volume rather than for your mail. Flagged messages are set aside, never deleted.
Threads that span addresses
A conversation that touched two of your addresses is one thread, not two halves you reconcile in your head. One search covers every combined mailbox.
Two-way sync, nothing moved
Read, archive, and reply from the board and the change syncs back to the real mailbox. Your mail keeps living on its current provider exactly as before.
In the browser, on any machine
Nothing to install. The same combined, sorted board opens on a second laptop, a borrowed computer, or a locked-down work machine where you cannot install a client.
How it works
Three steps to a combined inbox
Nothing is migrated and nothing is installed. Your mail keeps living on its current provider while you work from one sorted board.
> connecting your mailboxes over IMAP
Connect your mailboxes
Add each account with its IMAP server and credentials: Gmail, Outlook, Yahoo, iCloud, your own domain, anything that speaks IMAP. Add as many as you like. Inboxes reads them; your mail keeps living on your own provider.
> AI categorizing + flagging spam
AI sorts every message
As mail arrives, Gemini reads it and assigns a category and a spam verdict. Newsletters, receipts, work, and personal mail land in the right place, and junk is flagged, so the unified board you open is already triaged instead of a raw pile.
> one board, threaded and in sync
Work from one board
Read, tag, thread, and search across every connected account from a single view. Everything syncs back to the server continuously, so your mailboxes stay consistent whether you open Inboxes or the provider directly.
Who this is for
Worth paying for when the accounts are a work problem
Two light accounts do not need a paid tool. These situations do.
Freelancers and consultants
A personal address, a business domain, and a client alias or two. Combining them puts client work and receipts in front of you without four logins, and the receipts sort themselves for invoicing week.
Founders and operators
You are on hello@, your own name, and two legacy domains you cannot retire. Combining them into one categorized board beats four browser tabs and the sense that something is unanswered.
Bookkeepers and accountants
Statements, receipts, and client threads land at several addresses. Combining them and auto-categorizing the receipts turns month-end from a hunt into a filter.
Anyone juggling work and personal mail
Keeping the addresses separate is right. Reading them in two places is what costs you. Combining the accounts while keeping the identities apart gives you both.
Agencies
Every client hands you another login. Combining them over IMAP puts the whole portfolio on one board without asking a single client to change how their mail works.
Anyone on a locked-down machine
If IT will not let you install a desktop client, a browser-based combined inbox is the only option that works. Nothing to install, on any machine you sit down at.
FAQ
Questions people ask about combining email accounts
Can you combine email accounts?
Yes, in two very different ways. You can merge them, by forwarding everything from your other addresses into one account, which physically moves the mail and is hard to undo. Or you can combine them in a client, where each account stays its own mailbox and a single app shows all of them in one list. The second way is what most people actually want, because replies still leave from the correct address.
How do I combine email accounts in Gmail?
Gmail has no unified inbox for separate Google accounts on the web. The supported route is Settings, then Accounts and Import, where you add the other address under "Check mail from other accounts" and add it as a send-as address. That pulls the mail into one Gmail and lets you reply from the right address, but it merges the mail into a single mailbox and Google is retiring the POP-based version of that feature.
How do I combine email accounts in Outlook?
Add each account under File, then Add Account, and Outlook lists them as separate mailboxes in the folder pane. Outlook has no true combined inbox on the desktop; the closest built-in option is a search folder set to unread mail across all mailboxes, which gives you one list but not one real inbox. Outlook on the web shows only the account you signed in with.
How do I combine email accounts on an iPhone?
The iPhone Mail app does this out of the box. Add each account under Settings, then Mail, then Accounts, and open Mail, tap Mailboxes in the top left, tap Edit, and turn on All Inboxes. Every account then appears in one combined list on the phone. That view lives on the phone only; it does not follow you to a laptop or a browser.
Can you merge two email accounts into one?
You can redirect one into the other, but you cannot truly merge two accounts. Google, Microsoft, and Apple all treat accounts as permanent and separate; there is no button that fuses them. What you can do is forward all incoming mail from account B to account A, add B as a send-as address, and leave B open as a landing address. That is a redirect, not a merge, and the two accounts still exist.
Is it better to have one email account or multiple?
Multiple accounts are better for separation and worse for attention. Keeping work, personal, and business mail on separate addresses protects each identity, keeps client mail out of your personal life, and survives a job change. The cost is that your attention is now split across several inboxes. The fix is not fewer accounts, it is one place to read all of them.
How do I consolidate all my email accounts in one place?
Connect each mailbox over IMAP to a client that shows them together, rather than forwarding them into a single provider. IMAP leaves the mail where it lives, so nothing is migrated and nothing is lost if you change tools later. Inboxes does this in the browser: connect Gmail, Outlook, iCloud, Yahoo, and any custom-domain mailbox, and every account appears on one board with AI categories applied to each message.
Combine every account on one board
Connect your mailboxes over IMAP and every message that lands is read, categorized, and de-spammed before you open the board. Nothing is migrated and nothing is installed.