using System;

using MimeKit;

using System.Threading.Tasks;

using System.Collections.Generic;

using MailKit.Net.Smtp;

public class Program

{

    public static void Main() {

        Console.WriteLine("Main");

        var e = new Emailer();

        var tmp = e.SendEmailAsync();

        Console.WriteLine("ttt" + tmp);

    }

}

​

public class Emailer {

    public Emailer() {}

    public async Task<string> SendEmailAsync() {    

        Console.WriteLine("Start");

        var m = new MimeMessage();

        try {

            m.From.Add(new MailboxAddress("RtestFrom", "knocksoap@gmail.com"));

            m.To.Add(new MailboxAddress("RtestTo", "knocksoap@gmail.com"));

            m.Subject = "any";

            m.Body = new TextPart(MimeKit.Text.TextFormat.Html)

            {

                Text = "test_message"

            };

            using (var client = new SmtpClient())

            {

                await client.ConnectAsync("smtp.gmail.com", 587, true);

                await client.AuthenticateAsync("knocksoap@gmail.com", "x88av55nliza");

                await client.SendAsync(m);

                await client.DisconnectAsync(true);

            }

            Console.WriteLine("End");

        }

        catch (Exception e) {

            Console.WriteLine(e.Message);

            return "with error";

        }

​

        return "finished";

    }

}