send mail using C#

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Import namespaces

using System.ComponentModel;
using System.Net;
using System.Net.Mail;

Code

// create message
MailMessage message = new MailMessage();
message.From = new MailAddress("username@server-name.com", "username");
message.To.Add(new MailAddress("recipient@another-server.com", "recipientname"));
message.Subject = "subject";
message.Body = "body";

// create and set up smtp client
SmtpClient client = new SmtpClient();
client.Credentials = new NetworkCredential("username", "password");
client.Port = 25;
client.Host = "smtp.server-name.com";
client.EnableSsl = false;
client.SendCompleted += new SendCompletedEventHandler(client_SendCompleted);

// send email asynchronically
client.SendAsync(message, message);

Handler method

// event handler invoked after send
private void client_SendCompleted(object sender, AsyncCompletedEventArgs e)
{
    MailMessage mail = (MailMessage)e.UserState;

    // sending was canceled
    bool canceled = e.Cancelled;

    // possible error
    Exception error = e.Error;
}

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