--- title: "Error sending message: Error sending message. MS365 returned status 403..." description: This issue may arise if you're attempting to send an email from an address different from the one connected with your Acctivate account. You can take these steps below to ensure that you're using the correct email address.  --- [Skip to content](https://hub.acctivate.com/articles/error-sending-message-error-sending-message.-ms365-returned-status-403#main-content) [Go to Customer Portal](https://hub.acctivate.com/tickets?hsLang=en) ![Acctivate - A CAI Solution](https://hub.acctivate.com/hubfs/Images/Logos/acctivate-cai-logo-svg.svg) - [Knowledge Base](https://hub.acctivate.com/articles) Open main navigation Close main navigation - [Knowledge Base](https://hub.acctivate.com/articles) - [Go to Customer Portal](https://hub.acctivate.com/tickets) - [Support Resources / Create Ticket](https://acctivate.com/support) [Support Resources / Create Ticket](https://acctivate.com/support) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://hub.acctivate.com/articles?hsLang=en) 2. [Troubleshoot](https://hub.acctivate.com/articles/troubleshoot?hsLang=en) 3. [Email](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#email) June 4, 2025 # Error sending message: Error sending message. MS365 returned status 403... ## You'll need the "Send As" permission to send email from another email address in your organization. ![](https://hub.acctivate.com/hs-fs/hubfs/image-png-Sep-30-2024-04-46-44-5023-PM.png?width=670&height=302&name=image-png-Sep-30-2024-04-46-44-5023-PM.png) ``` Error sending message: Error sending message. MS365 returned status 403: The user account which was used to submit this request does not have the right to send mail on behalf of the specified sending account., Cannot submit message.  ``` ### First, let's **confirm your Microsoft 365 connection** For Microsoft 365, we recommend that each user is connected to their individual ("Personal") email account like username@example.com. 1. In Acctivate, click **File \> User Settings\*** and look at the **Email Settings** section 2. Your email address should be listed as **"Connected to: ..." ** By default, Microsoft only allows you to send email from this email address. 3. To send on behalf of a group or another user, your **Microsoft 365 Admin** will need to grant you **"Send as" permission** for that email address 4. Your admin will need to use the following procedures depending on the mailbox type. ### Instructions for a **Distribution Group** or **Shared Mailbox** This is a common scenario for sending email from a distribution group like sales@example.com or support@example.com: 1. Go to [https://admin.exchange.microsoft.com](https://admin.exchange.microsoft.com) and log in as an Admin user. 2. In the left pane, go to **Recipients \> Groups** 3. You may need to **click on the Group type** (e.g., Microsoft 365, Distribution list, etc) 4. Click the **Group name** to Edit the Group 5. Under **Members**, click **View all and manage members** to add the user if not already in the list. 6. Under **Settings**, Click **Edit manage delegates** 7. **Add a delegate** for each group member who needs to "Send as" or "Send on behalf" of the group 8. Click **Save Changes** ### Instructions for a **User Mailbox** This procedure allows one Microsoft 365 user to send email on behalf of a colleague's email address. 1. Go to [https://admin.exchange.microsoft.com](https://admin.exchange.microsoft.com) and log in as an Admin user. 2. In the left pane, go to **Recipients \> Mailboxes** 3. Click the **Display name** to Edit the mailbox 4. Under **Delegation**, click **Edit **under the **Send as** section. 5. Click **Add members **for each user who needs to "Send as" or "Send on behalf" of this mailbox 6. Click **Save Changes** --- ### 🔄 Changes may take up to 60 minutes to take effect. --- \* File \> User Settings was added in Version 14. You'll need an admin to open File \> Configuration Manager \> User \> User Information for older versions. - [Getting Started](https://hub.acctivate.com/articles/getting-started?hsLang=en#main-content) - [Basics](https://hub.acctivate.com/articles/getting-started?hsLang=en#basics) - [User Interface](https://hub.acctivate.com/articles/getting-started?hsLang=en#user-interface) - [Manager windows](https://hub.acctivate.com/articles/getting-started?hsLang=en#manager-windows) - [List windows](https://hub.acctivate.com/articles/getting-started?hsLang=en#list-windows) - [Transaction windows](https://hub.acctivate.com/articles/getting-started?hsLang=en#transaction-windows) - [License and Users](https://hub.acctivate.com/articles/getting-started?hsLang=en#license-and-users) - [Email](https://hub.acctivate.com/articles/getting-started?hsLang=en#email) - [Getting Help](https://hub.acctivate.com/articles/getting-started?hsLang=en#getting-help) - [Installation](https://hub.acctivate.com/articles/installation?hsLang=en#main-content) - [Acctivate](https://hub.acctivate.com/articles/installation?hsLang=en#acctivate) - [Database Server](https://hub.acctivate.com/articles/installation?hsLang=en#database-server) - [Mobile WMS Setup](https://hub.acctivate.com/articles/installation?hsLang=en#mobile-wms-setup) - [Software Updates](https://hub.acctivate.com/articles/installation?hsLang=en#software-updates) - [Email Setup](https://hub.acctivate.com/articles/installation?hsLang=en#email-setup) - [Remote Access](https://hub.acctivate.com/articles/installation?hsLang=en#remote-access) - [Configuration](https://hub.acctivate.com/articles/configuration?hsLang=en#main-content) - [Basics](https://hub.acctivate.com/articles/configuration?hsLang=en#basics) - [Users](https://hub.acctivate.com/articles/configuration?hsLang=en#users) - [Company Info](https://hub.acctivate.com/articles/configuration?hsLang=en#company-info) - [Customers](https://hub.acctivate.com/articles/configuration?hsLang=en#customers) - [Sales Orders](https://hub.acctivate.com/articles/configuration?hsLang=en#sales-orders) - [Inventory](https://hub.acctivate.com/articles/configuration?hsLang=en#inventory) - [Custom Fields](https://hub.acctivate.com/articles/configuration?hsLang=en#custom-fields) - [Email Message Templates](https://hub.acctivate.com/articles/configuration?hsLang=en#email-message-templates) - [Services](https://hub.acctivate.com/articles/configuration?hsLang=en#services) - [Inventory](https://hub.acctivate.com/articles/inventory?hsLang=en#main-content) - [Products](https://hub.acctivate.com/articles/inventory?hsLang=en#products) - [Costing](https://hub.acctivate.com/articles/inventory?hsLang=en#costing) - [Prices and Units](https://hub.acctivate.com/articles/inventory?hsLang=en#prices-and-units) - [Warehouses and Locations](https://hub.acctivate.com/articles/inventory?hsLang=en#warehouses-and-locations) - [Lot Numbers](https://hub.acctivate.com/articles/inventory?hsLang=en#lot-numbers) - [Inventory Manager](https://hub.acctivate.com/articles/inventory?hsLang=en#inventory-manager) - [Receipts](https://hub.acctivate.com/articles/inventory?hsLang=en#receipts) - [Assemblies](https://hub.acctivate.com/articles/inventory?hsLang=en#assemblies) - [Kits and Assortments](https://hub.acctivate.com/articles/inventory?hsLang=en#kits-and-assortments) - [Landed Cost](https://hub.acctivate.com/articles/inventory?hsLang=en#landed-cost) - [Transfers](https://hub.acctivate.com/articles/inventory?hsLang=en#transfers) - [Adjustments](https://hub.acctivate.com/articles/inventory?hsLang=en#adjustments) - [Counts](https://hub.acctivate.com/articles/inventory?hsLang=en#counts) - [Reports](https://hub.acctivate.com/articles/inventory?hsLang=en#reports) - [Purchasing](https://hub.acctivate.com/articles/purchasing?hsLang=en#main-content) - [Purchase Orders](https://hub.acctivate.com/articles/purchasing?hsLang=en#purchase-orders) - [Purchase Order Manager](https://hub.acctivate.com/articles/purchasing?hsLang=en#purchase-order-manager) - [Purchase Invoices](https://hub.acctivate.com/articles/purchasing?hsLang=en#purchase-invoices) - [Vendors](https://hub.acctivate.com/articles/purchasing?hsLang=en#vendors) - [Customers](https://hub.acctivate.com/articles/customers?hsLang=en#main-content) - [Customers](https://hub.acctivate.com/articles/customers?hsLang=en#customers) - [Locations](https://hub.acctivate.com/articles/customers?hsLang=en#locations) - [Credit & Terms](https://hub.acctivate.com/articles/customers?hsLang=en#credit-terms) - [Pricing](https://hub.acctivate.com/articles/customers?hsLang=en#pricing) - [Broadcast Email](https://hub.acctivate.com/articles/customers?hsLang=en#broadcast-email) - [Sales](https://hub.acctivate.com/articles/sales?hsLang=en#main-content) - [Orders](https://hub.acctivate.com/articles/sales?hsLang=en#orders) - [Sales Order Manager](https://hub.acctivate.com/articles/sales?hsLang=en#sales-order-manager) - [Picking](https://hub.acctivate.com/articles/sales?hsLang=en#picking) - [Drop Shipments](https://hub.acctivate.com/articles/sales?hsLang=en#drop-shipments) - [Sales Tax](https://hub.acctivate.com/articles/sales?hsLang=en#sales-tax) - [Packaging](https://hub.acctivate.com/articles/sales?hsLang=en#packaging) - [Shipping](https://hub.acctivate.com/articles/sales?hsLang=en#shipping) - [Invoices](https://hub.acctivate.com/articles/sales?hsLang=en#invoices) - [Payments](https://hub.acctivate.com/articles/sales?hsLang=en#payments) - [Credits](https://hub.acctivate.com/articles/sales?hsLang=en#credits) - [Business Activities](https://hub.acctivate.com/articles/business-activities?hsLang=en#main-content) - [Business Activities](https://hub.acctivate.com/articles/business-activities?hsLang=en#business-activities) - [Business Alerts](https://hub.acctivate.com/articles/business-activities?hsLang=en#business-alerts) - [QuickBooks](https://hub.acctivate.com/articles/quickbooks?hsLang=en#main-content) - [Basics](https://hub.acctivate.com/articles/quickbooks?hsLang=en#basics) - [QuickBooks Online](https://hub.acctivate.com/articles/quickbooks?hsLang=en#quickbooks-online) - [QuickBooks Desktop](https://hub.acctivate.com/articles/quickbooks?hsLang=en#quickbooks-desktop) - [Mobile WMS](https://hub.acctivate.com/articles/mobile-wms?hsLang=en#main-content) - [Basics](https://hub.acctivate.com/articles/mobile-wms?hsLang=en#basics) - [Picking](https://hub.acctivate.com/articles/mobile-wms?hsLang=en#picking) - [Receiving](https://hub.acctivate.com/articles/mobile-wms?hsLang=en#receiving) - [Counts](https://hub.acctivate.com/articles/mobile-wms?hsLang=en#counts) - [Assemblies](https://hub.acctivate.com/articles/mobile-wms?hsLang=en#assemblies) - [Web Store Integrations](https://hub.acctivate.com/articles/web-store-integrations?hsLang=en#main-content) - [Basics](https://hub.acctivate.com/articles/web-store-integrations?hsLang=en#basics) - [Templates and Options](https://hub.acctivate.com/articles/web-store-integrations?hsLang=en#templates-and-options) - [EDI](https://hub.acctivate.com/articles/edi?hsLang=en#main-content) - [Basics](https://hub.acctivate.com/articles/edi?hsLang=en#basics) - [Orders - 850](https://hub.acctivate.com/articles/edi?hsLang=en#orders-850) - [Shipments - 856](https://hub.acctivate.com/articles/edi?hsLang=en#shipments-856) - [Invoices - 810](https://hub.acctivate.com/articles/edi?hsLang=en#invoices-810) - [Warehouse - 940/945](https://hub.acctivate.com/articles/edi?hsLang=en#warehouse-940-945) - [Reports](https://hub.acctivate.com/articles/reports?hsLang=en#main-content) - [Basics](https://hub.acctivate.com/articles/reports?hsLang=en#basics) - [Standard Reports](https://hub.acctivate.com/articles/reports?hsLang=en#standard-reports) - [Crystal Reports](https://hub.acctivate.com/articles/reports?hsLang=en#crystal-reports) - [Excel](https://hub.acctivate.com/articles/reports?hsLang=en#excel) - [Database](https://hub.acctivate.com/articles/database?hsLang=en#main-content) - [Basics](https://hub.acctivate.com/articles/database?hsLang=en#basics) - [Backup & Restore](https://hub.acctivate.com/articles/database?hsLang=en#backup-restore) - [Microsoft SQL Server](https://hub.acctivate.com/articles/database?hsLang=en#microsoft-sql-server) - [Imports](https://hub.acctivate.com/articles/database?hsLang=en#imports) - [Troubleshoot](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#main-content) - [General](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#general) - [Installation](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#installation) - [Inventory](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#inventory) - [Purchasing](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#purchasing) - [Sales](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#sales) - [Shipping](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#shipping) - [QuickBooks Desktop](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#quickbooks-desktop) - [QuickBooks Online](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#quickbooks-online) - [Mobile WMS](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#mobile-wms) - [Web Store Integration](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#web-store-integration) - [EDI](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#edi) - [Reports](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#reports) - [Database](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#database) - [Imports](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#imports) - [Email](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#email) - [Integrations](https://hub.acctivate.com/articles/troubleshoot?hsLang=en#integrations) [![Acctivate Inventory Software](https://hub.acctivate.com/hubfs/Images/Logos/acctivate-cai-logo-svg.svg "Acctivate Inventory Software")](https://acctivate.com) Acctivate Knowledge Base [mailto:support@acctivate.com](mailto:support@acctivate.com) Copyright © 2025, Alterity, LLC