I am a corporate employee. as part of my work I need to send emails from my C# code.

with the below code I am able to send emails successfully using less secure gmail ID. But I am not able to do same with my corporate outlook exchange based email ID. I get below exception.

" The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 Client not authenticated to send mail. Error: 535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox. Visit https://aka.ms/smtp_auth_disabled for more information. [BN9PR03CA0659.namprd03.prod.outlook.com]"

what I should do ? is there a way I can make my corporate outlook exchange email ID less secure to enable to sending emails. (Like I did for gmail.)

below is the code I am using.

MailMessage message = new MailMessage(from, to);

        string mailbody = "In this article you will learn how to send a email using Asp.Net & C#";
        message.Subject = "Sending Email Using Asp.Net & C#";
        message.Body = mailbody;
        message.BodyEncoding = Encoding.UTF8;
        message.IsBodyHtml = true;         
        client.EnableSsl = true;
        client.UseDefaultCredentials = false;
        client.Credentials = new NetworkCredential("name@corporatecompany.com", "$password");            
        client.Host = "smtp.office365.com";
        client.Port = 587;
        client.DeliveryMethod = SmtpDeliveryMethod.Network;          
        try
        {
            client.Send(message);
        }