Custom domains on Google Workspace or Microsoft 365

How we tell

A custom domain, like you@yourcompany.com, can be hosted anywhere. We look up where the domain's mail is delivered. If it goes to Google, we use Google sign-in. If it goes to Microsoft, we use Microsoft sign-in. Otherwise we treat it as IMAP. We never assume an unknown domain is Google.

Choose the service yourself

1. On Inboxes, enter the label and address.
2. Set Mail service to Google (Gmail / Workspace) or Microsoft (Outlook.com / Microsoft 365).
3. Choose Add inbox, then Connect.

If you are not sure where your domain's mail lives, ask whoever set up your email, or check the admin page where you manage your domain.

Why it matters

Google and Microsoft sign-in need no password on our form, and a Workspace inbox connected through Google gets Gmail labels and stars. Connecting a Workspace domain over IMAP can also fail if your admin has turned IMAP off.

Telling your AI

If your AI adds the inbox for you, tell it where the domain is hosted: "my work address is on Microsoft 365." It can then pick the right sign-in instead of the default.