All your mail.
One inbox.
Connect Gmail, Outlook, and any IMAP mailbox — personal or corporate — and read, search, and reply to all of them from one Apple-styled inbox, without ever switching apps.
No credit card to start · Self-hosted · Upgrade anytime
Connect
Add Gmail, Outlook, or any IMAP mailbox with an app password. Credentials are encrypted at rest — AES-256, never stored in plain text.
Unify
Every mailbox lands in one Apple-styled 3-pane inbox. Filter by mailbox, search across all of them, or read them as one unbroken stream.
Reply
Send from any connected mailbox over SMTP, right where you read it. No app-switching, no forgetting which inbox a thread lives in.
Why self-hosted
Your mail never leaves your server.
Most unified-inbox tools are someone else's cloud — your messages sit on their servers, under their retention policy. UseOneInbox runs on infrastructure you control. Credentials and tokens are encrypted with AES-256-GCM before they touch disk, and nothing is ever synced to a third party.
No vendor lock-in
It's your database, your server, your backups. Walk away any time with everything intact.
Encrypted at rest
App passwords and OAuth tokens are AES-256-GCM encrypted the moment they're saved.
Nothing shared
No analytics vendor, no ad network, no third party ever sees your inbox.
Built for more than one mailbox
One account. Every corporate mailbox you manage.
Running sales@, support@, and info@ out of separate logins? Freelancers juggling client inboxes and agencies running several company mailboxes hit the same wall — connect every one of them to a single account instead.
sales@, support@, info@ — one login
The classic small-business setup: every department's inbox in the same place, no more switching accounts to check support after sales.
Share without sharing passwords
Grant a teammate access to a shared mailbox and revoke it any time — credentials never change hands.
Hand off ownership in one click
Someone leaving the team? Transfer their mailbox to whoever takes over, instantly and permanently.
STOP SWITCHING TABS.
START READING MAIL.
Built to be trusted with your mail
Instant sync
A background worker holds an IMAP IDLE connection open per mailbox, so new mail lands immediately — no polling delay.
Every folder, found automatically
Inbox, Sent, Spam, Drafts, Trash — detected straight from your server's own settings, not guessed from folder names.
Encrypted at rest
App passwords and OAuth tokens are encrypted with AES-256-GCM before they ever touch disk.
Built to fit how you work
Resize the panels, drag mailboxes into your own order, zoom the whole workspace — every choice is remembered.
Share or transfer any mailbox
Grant a teammate access to a shared inbox, or hand off ownership entirely when someone leaves — no passwords change hands.
Your server, your data
Self-hosted. No inbox data ever leaves infrastructure you control.
Works with
Pricing
Start free. Pay only if you outgrow it.
No trial, no seat limit, no card required to sign up — upgrade only when you actually need more room.
Free
Everything most people need to run one unified inbox.
- ✓5 connected mailboxes
- ✓5GB of synced mail storage
- ✓Instant IMAP IDLE sync
- ✓Gmail, Outlook, and any IMAP server
- ✓AES-256 encrypted credentials
Add-on packs
Stack as many packs as you need, cancel any time — pay by card, wallet, or crypto.
- ✓+5 mailboxes per pack
- ✓or +10GB storage per pack
- ✓Mix and match either kind
- ✓Manage or cancel any time
Why is the free plan so generous?
UseOneInbox runs on infrastructure we already operate, so a single mailbox costs us almost nothing to serve. The free plan is meant to be genuinely usable on its own — paid packs exist only for people who outgrow it, not as a paywall on core features.
Questions
Frequently asked questions
What is a unified inbox?+
A unified inbox brings mail from several separate email accounts — Gmail, Outlook, a business IMAP mailbox — into one screen, so you read, search, and reply to all of them without switching apps or tabs. UseOneInbox is a unified inbox you self-host, so that combined view never leaves your own server.
Can I combine Gmail and Outlook into one inbox?+
Yes. Connect any number of Gmail, Outlook, and IMAP mailboxes — personal or corporate — and every one of them appears in the same 3-pane inbox. Filter down to a single mailbox or read them all as one stream.
Is UseOneInbox free?+
The free plan includes 5 connected mailboxes and 5GB of synced mail storage, permanently, with no credit card required. Add-on packs (+5 mailboxes or +10GB each) are available for accounts that outgrow that.
Is my email data safe with a self-hosted email client?+
Mailbox credentials and OAuth tokens are encrypted with AES-256-GCM before they ever touch disk, and your mail is stored on infrastructure you control — not a third-party cloud. Nothing is ever synced to an analytics vendor or ad network.
Does UseOneInbox work with custom business IMAP servers?+
Yes — any mailbox that supports IMAP and SMTP works, not just Gmail and Outlook. Folders (Inbox, Sent, Spam, Drafts, Trash) are detected automatically from your server's own settings.
How is this different from Gmail's multiple inboxes or delegation?+
Gmail's built-in tools only combine views inside Gmail itself. UseOneInbox unifies mailboxes across completely different providers — Gmail, Outlook, and any IMAP server — in one inbox that isn't tied to any single provider's ecosystem.
We're listening
Got an idea, or found something broken?
Tell us what's missing, what's confusing, or what you'd love to see next — every message goes straight to the team, not a ticket queue.