(DataFlex) Office365 SMTP Send Email Client Credentials

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Demonstrates how to send email using the Office365 SMTP server with OAuth2 client credentials. This example uses a new feature available starting in Chilkat v9.5.0.97, which is to provide the client ID, client secret, and tenant ID to Chilkat, and internally Chilkat will fetch OAuth2 access token via client credentials as necessary. Therefore, it is no longer necessary for the application to explicitly fetch the OAuth2 access token beforehand.

Note: This requires the Azure Entra ID application to be configured for client credentials as detailed in this guide: Office365 App Setup for SMTP, POP, IMAP OAuth2 Client Credentials

Note: This example requires Chilkat v9.5.0.97 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoMailman
    Boolean iSuccess
    Handle hoJson
    Variant vEmail
    Handle hoEmail
    String sTemp1

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    Get Create (RefClass(cComChilkatMailMan)) To hoMailman
    If (Not(IsComObjectCreated(hoMailman))) Begin
        Send CreateComObject of hoMailman
    End

    Set ComSmtpHost Of hoMailman To "smtp.office365.com"
    Set ComSmtpPort Of hoMailman To 587
    Set ComStartTLS Of hoMailman To True

    // ----------------------------------------------------------------------------------------
    // Important:
    // Your Azure Entra ID app must be explicitly setup to allow for the OAuth2 client credentials flow.
    // Please follow the detailed guide for how to do it here:
    // Office365 App Setup for SMTP, POP, IMAP OAuth2 Client Credentials
    // 
    // Note: Your registered App must have the SMTP.SendAsApp permission.
    // ----------------------------------------------------------------------------------------

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End

    // Use your App's actual client ID here:
    Get ComUpdateString Of hoJson "client_id" "2871da2c-8176-4b7f-869b-2311aa82e743" To iSuccess

    // Use your App's actual client secret here:
    Get ComUpdateString Of hoJson "client_secret" "2hu9Q~r5QuryUcEkNbg1btLtnfU1VUXzhSCG6brH" To iSuccess

    // Use this specific scope.
    Get ComUpdateString Of hoJson "scope" "https://outlook.office365.com/.default" To iSuccess

    // Replace the tenant ID part of the URL with your tenant ID.
    Get ComUpdateString Of hoJson "token_endpoint" "https://login.microsoftonline.com/114d7ed6-71bf-4dbe-a866-748364121bf2/oauth2/v2.0/token" To iSuccess

    // Here is where we use a new feature introduced in Chilkat v9.5.0.97
    // Instead of providing a previously fetched OAuth2 access token, we instead provide the information (above)
    // required for Chilkat to automatically fetch the access token via client credentials.
    Get ComEmit Of hoJson To sTemp1
    Set ComOAuth2AccessToken Of hoMailman To sTemp1

    // Use your Office365 email address for the SmtpUsername.
    Set ComSmtpUsername Of hoMailman To "OFFICE365_EMAIL_ADDRESS"

    // Create a new email object
    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End

    Set ComSubject Of hoEmail To "This is a test"
    Set ComBody Of hoEmail To "This is a test"
    Set ComFrom Of hoEmail To "MY_NAME <OFFICE365_EMAIL_ADDRESS>"
    Get ComAddTo Of hoEmail "John Doe" "somebody@example.com" To iSuccess

    // Call SendEmail to connect to the SMTP server and send.
    // The connection (i.e. session) to the SMTP server remains
    // open so that subsequent SendEmail calls may use the
    // same connection.  
    Get pvComObject of hoEmail to vEmail
    Get ComSendEmail Of hoMailman vEmail To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComCloseSmtpConnection Of hoMailman To iSuccess
    If (iSuccess <> True) Begin
        Showln "Connection to SMTP server not closed cleanly."
    End

    Showln "Mail Sent!"


End_Procedure