Emailing from asp net using office 365 online exchange


ASP.NET is a popular programming language used for building web applications. One common requirement in web applications is the ability to send emails. In this article, we will explore how to send emails from an ASP.NET Office 365 Online Exchange.


we begin, make sure you have the following:

  • An Office 365 with Exchange Online enabled
  • An ASP.NET application set up and running

Setting up Office 365 Online Exchange

To send emails from your ASP.NET application using Office 365 Online Exchange, you need to configure the necessary settings in your Office 365 account.

1. Log in to your Office 365 account.

2. Go to the Exchange admin center.

3. Navigate to the “Mail Flow” section.

4. Click on “Connectors” and then “New” to create a new connector.

5. Select “Office 365” as the connector type.

6. Choose the appropriate options for your scenario (e.g., “From: Office 365” and “To: Partner organization”).

7. Follow the on-screen instructions to complete the connector setup.

Configuring ASP.NET Application

Now that we have set up Office 365 Online Exchange, let's configure our ASP.NET application to send emails using it.

1. Open your ASP.NET application in Visual Studio.

2. Add a reference to the System.Net.Mail namespace.

3. In your code, create an instance of the SmtpClient class.

4. Set the Host property of the SmtpClient instance to the SMTP provided by Office 365 Online Exchange.

5. Set the Port property of the SmtpClient instance to the appropriate port number (usually 587).

6. Set the EnableSsl property of the SmtpClient instance to true to enable secure communication.

7. Set the property of the SmtpClient instance to your Office 365 account credentials.

8. Create an instance of the MailMessage class and set the necessary such as From, To, Subject, and Body.

9. Use the Send method of the SmtpClient instance to send the email.


Here is an example of sending an email from an ASP.NET application using Office 365 Online Exchange:

using System;
using System.Net.Mail;

namespace EmailExample
        static void Main(string[] args)
            SmtpClient client = new SmtpClient();
            client.Host = "";
            client.Port = 587;
            client.EnableSsl = true;
            client.Credentials = new System.Net.NetworkCredential("", "your-password");

            MailMessage message = new MailMessage();
            message.From = new MailAddress("");
            message.Subject = " from ASP.NET";
            message.Body = "This is a test email sent from an ASP.NET application using Office 365 Online Exchange.";


            Console.WriteLine("Email sent successfully.");

Make sure to “” and “your-password” with your actual Office 365 account credentials. Also, update the recipient's email address and the email content as per your requirements.


In this article, we have learned how to send emails from an ASP.NET application using Office 365 Online Exchange. By following the steps and example provided, you can easily integrate email functionality into your ASP.NET web applications.

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