asp.net c# Web Forms send email using outlook 365 - asp.net

Question

this was my code for my local machine before my company switched to outlook 365:
SmtpClient SMTP Client = new SmtpClient(ConfigurationManager.AppSettings["EMailServer"]);
smtpClient.Send(message);
Since the outlook was changed, I google and find this code, however it does not work giving error code "Failed to send email" "General failure".
Please help me to resolve this issue
here is a new code:
SmtpClient client = new SmtpClient();
client.UseDefaultCredentials = false;
client.Credentials = new System.Net.NetworkCredentmailial("email address", "network password");
client.Port = 25; // You can use Port 25 if 587 is blocked (mine is!)
client.Host = "smtp.office365.com";
//client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.EnableSsl = true;
client.TargetName = "STARTTLS/smtp.office365.com";
client.Send(message);
Thank you very much.
Vitaly.

Answer 1

This is the code I use to send the email using HOST smtp.office365.com
var fromAddress = new MailAddress("from#domain.com", "From Name");
var toAddress = new MailAddress("to#domain.com", "To Name");
string fromPassword = "Your_email_password";
string subject = "Test Subject";
string body = "Test Message";
var smtp = new SmtpClient
{
Host = "smtp.office365.com",
Port = 25, //Recommended port is 587
EnableSsl = false,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
Credentials = new NetworkCredential(fromAddress.Address, fromPassword),
};
using (var message = new MailMessage(fromAddress, toAddress)
{
Subject = subject,
Body = body,
IsBodyHtml = true
})
{
smtp.Send(message);
}
Please check that is your port 25 is blocked by OS or not.