About InboxAPI

InboxAPI lets you connect your own Outlook or Hotmail mailbox and send email through it, using Microsoft's official Graph API and a standard, secure OAuth sign-in flow.

Why we built it

Most email-sending tools route your mail through a shared platform domain, which means building sender reputation from scratch and never quite sending "as you." InboxAPI takes the opposite approach: every message goes out through the mailbox you actually connected, so it behaves exactly like sending from Outlook yourself because it is.

How it works

You sign in with your Microsoft account through a delegated OAuth flow. InboxAPI only ever requests permission to read your basic profile and send mail on your behalf never to read your inbox. You can disconnect access at any time, both from your InboxAPI dashboard and directly from your Microsoft account settings.

Who it's for

Developers and small teams who want reliable, identity-preserving email sending without standing up mail infrastructure of their own.