Every domain’s email, in Outlook — on one Microsoft 365 license.
inboxroot turns each of your domains into its own free shared mailbox in your existing Microsoft 365 tenant, so you send and receive natively in Outlook — no extra seats. Postmark handles transactional mail on the same domains.
Connect your own Microsoft 365 & Postmark · Cancel anytime · No seat per domain
From new domain to a working inbox in three steps
inboxroot automates the Microsoft 365 and Postmark setup that would otherwise take an admin an afternoon per domain.
Connect your tenant
Sign in and grant inboxroot consent to your Microsoft 365 tenant and Postmark account — once. Your credentials stay yours; we never resell mailboxes.
Add a domain
Enter kibipay.com. inboxroot generates every DNS record — MX, DKIM, Return-Path and a merged SPF — and checks them live until they resolve.
Send from Outlook
We create a free shared mailbox and grant your account access, sohello@kibipay.com mounts in Outlook — its own inbox, its own send identity.
Microsoft charges per license, not per domain or mailbox. Shared mailboxes are free under 50 GB. inboxroot turns that into a repeatable, one-click workflow — so ten domains cost the same as one seat.
Built for people who run a lot of domains
Native Outlook
Each domain is a real shared mailbox — send, receive, reply as that address, right in the Outlook you already use.
Own your tenant
Everything runs in your Microsoft 365 and your Postmark. inboxroot orchestrates; it never holds your mail.
DNS done for you
Auto-generated MX, DKIM, Return-Path and a single merged SPF, with a live checker that tells you the moment they’re ready.
Transactional too
Postmark sends receipts and app email on the same domains — separate from human mail, with DKIM that coexists with M365.
Secure by design
SSO sign-in, per-tenant isolation, and encrypted connections. Your provisioning credentials are never exposed to the browser.
One dashboard
Every domain and its status — DNS, mailbox, send-as, Postmark — at a glance, with one-click onboarding.
Free while we’re in beta
inboxroot is free during the beta. Paid plans arrive later — beta users keep a founder discount.