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# Connect Outlook / Microsoft Sender

# Connect Outlook / Microsoft Sender

## Purpose

Microsoft Outlook and Office 365 mailboxes can be connected to SuperSend using OAuth or manual configuration. This article covers both paths so you can get a Microsoft mailbox sending as quickly as possible.

## Before You Start

Read [Senders Overview](https://help.supersend.io/en/article/senders-overview-vqg87v/) if this is your first time setting up senders. Connecting a mailbox is step one — you'll still need to attach it to a sender profile and assign that profile to a campaign before any email goes out.

## Open the Connection Wizard

1. Go to **Senders** in the left sidebar.
2. Click **Add Sender** → **Email Sender**.
3. On the method selection screen, click **Connect Your Own Mailboxes**.
4. On the provider list, click **Microsoft Outlook**.

## Method 1: OAuth (Recommended)

OAuth connects your Outlook mailbox through Microsoft's authorization flow without storing your password in SuperSend.

**Steps:**

1. Select the **OAuth** tab (default).
2. If your team already has a Microsoft OAuth app configured, it appears here. Click to select it.
3. Click **Connect Your Microsoft Account**.
4. A Microsoft sign-in window opens. Sign in with the account you want to connect.
5. Review the permissions requested and click **Accept**.
6. You're redirected back to SuperSend. The mailbox appears in your sender list.

**If no OAuth apps appear:** Your team admin needs to create one first. Click **Create OAuth App** and enter your Azure App Registration credentials (Application ID, Client Secret, Tenant ID, and Redirect URI). Once saved, it will be available for all team members to use when connecting their Outlook accounts.

## Method 2: Service account (Azure app registration)

Use this when your **Azure AD admin** has (or will) register an app in Microsoft Entra ID with **Graph application permissions** and you want to connect mailboxes **without** each user completing the OAuth consent screen—common for many mailboxes on one tenant.

1. Select the **Service Account** tab on the Microsoft Outlook connection step.
2. Select an existing **Microsoft service account**, or create one with your **Client ID**, **Client Secret**, and **Tenant ID** from Azure.
3. Enter the Outlook **email address** and finish the wizard.

Azure must include the correct **application** permissions (including **User.Read.All**) and **admin consent**. Full steps, permission table, org-admin location, and troubleshooting are in [Azure app registration and Microsoft service account (Outlook)](https://help.supersend.io/en/article/azure-app-registration-and-microsoft-service-account-outlook-g1uq5k/).

## Method 3: SMTP/IMAP (Manual)

For accounts where OAuth isn't available, or for hosted Exchange accounts that aren't on Microsoft's standard OAuth flow, you can connect using SMTP and IMAP credentials directly.

**Steps:**

1. Click the **SMTP/IMAP** or **Manual** tab.
2. Enter:
   - **Email** — your full Outlook or Office 365 email address.
   - **Password** — your account password (or an app password if your admin requires it).
   - **Send As Name** — the display name recipients see.
   - SMTP and IMAP settings are pre-filled with Microsoft's standard settings. If your organization uses custom Exchange settings, update them here.
3. Click **Connect**.

**Note on App Passwords:** If your Microsoft 365 tenant has multi-factor authentication enforced, regular passwords won't work for SMTP/IMAP. You'll need to generate a Microsoft App Password from your Microsoft account security settings.

## After Connecting

The mailbox appears in Senders → Mailboxes with its email address and connection status. Attach it to a sender profile:

1. Go to **Senders** → **Sender Profiles** tab.
2. Open a profile (or create one).
3. Click **Add Mailboxes** and select this mailbox.

See [Create and Use Sender Profiles](https://help.supersend.io/en/article/create-and-use-sender-profiles-1g4rjqt/) for full details.

## Expected Result

The Outlook mailbox shows as active in Senders → Mailboxes and is available to add to sender profiles.

## Troubleshooting

- **Issue:** OAuth connection shows "Need admin approval" from Microsoft.  
  **Fix:** Your organization's Azure AD admin has restricted OAuth app consent. The admin needs to grant consent for the SuperSend app registration in Azure, or switch to the SMTP/IMAP method.

- **Issue:** SMTP/IMAP connection fails with "authentication failed."  
  **Fix:** If your account has MFA enabled, standard passwords are blocked for SMTP. Generate and use an App Password from your Microsoft account security settings.

- **Issue:** Mailbox connects but doesn't receive incoming replies.  
  **Fix:** Confirm that IMAP is enabled on the account. In Outlook web settings, go to Mail → Sync email → toggle IMAP on.

## Related Articles

- [Senders Overview](https://help.supersend.io/en/article/senders-overview-vqg87v/)
- [Azure app registration and Microsoft service account (Outlook)](https://help.supersend.io/en/article/azure-app-registration-and-microsoft-service-account-outlook-g1uq5k/)
- [Connect Gmail/Google Workspace Sender](https://help.supersend.io/en/article/connect-gmail-google-workspace-sender-uofupz/)
- [Create and Use Sender Profiles](https://help.supersend.io/en/article/create-and-use-sender-profiles-1g4rjqt/)