Sending an email in C#

email.cs

using MimeKit;
using MailKit.Net.Smtp;

namespace TestClient
{
    class Program
    {
        public static void Main(string[] args)
        {
            var message = new MimeMessage();
            message.From.Add(new MailboxAddress("Joey Tribbiani", "joey@friends.com"));
            message.To.Add(new MailboxAddress("Mrs. Chanandler Bong", "chandler@friends.com"));
            message.Subject = "How you doin'?";

            message.Body = new TextPart("plain")
            {
                Text = @"Hey Chandler,

I just wanted to let you know that Monica and I were going to go play some paintball, you in?

-- Joey"
            };

            using var client = new SmtpClient();
            client.Connect("localhost", 25, false);

            // Note: only needed if the SMTP server requires authentication
            // client.Authenticate("username", "password");

            client.Send(message);
            client.Disconnect(true);
        }
    }
}