Connect Microsoft 365 accounts via OAuth
Connect Outlook or Microsoft 365 senders.
Microsoft OAuth lets Outlio use approved Microsoft permissions for sending and reply sync.
What this helps you do
Microsoft OAuth lets Outlio use approved Microsoft permissions for sending and reply sync.
Recommended workflow in Outlio
Choose Add Account, then Microsoft.
Sign in with the intended Outlook or Microsoft 365 mailbox.
Accept the permission screen or request admin approval if required.
Confirm the account appears in Outlio.
Check DKIM and SPF in Microsoft 365 before sending.
Quality checks
- Tenant admins may need to approve the app once for the organization.
- Use the mailbox itself, not a shared mailbox, unless the workspace supports that flow.
- If Microsoft blocks SMTP auth, OAuth is the safer path.
Common mistakes to avoid
- Trying to use a disabled mailbox.
- Launching before Microsoft DKIM is enabled.
Done well, this should leave you with
A cleaner Outlio setup, fewer avoidable campaign issues, and a more reliable path from setup to replies.
Related articles
How do I connect my accounts to Outlio?
Overview of supported account connection methods.
Connect Google accounts via OAuth
Connect Gmail or Google Workspace accounts securely.
Connect SMTP/IMAP accounts
Connect custom providers using server settings.
Account settings explained
Understand limits, sender identity, tracking, and account behavior.
Prepare multiple sending accounts
Checklist for adding several accounts safely.
How reply sync works
Understand how replies appear in Unibox.
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