Bước 1: Đầu tiên download MailForWindowsStore.dll tại đây. Xong, extract file vào thư mục bất kỳ trên máy tính.

Bước 2: Tiếp theo, right click vào Add Reference, chọn Add Reference, browse đến thư mục chứa file MailForWindowsStore.dll vừa extract. Chọn MailForWindowsStore.dll, click OK.

Bước 3:Code XAML cho form gửi email:

Code cho trang Mainpage.xaml.cs

using Limilabs.Mail;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Limilabs.Mail;
using Limilabs.Client.SMTP;
using Limilabs.Mail.Headers;
using Windows.UI.Popups;

namespace App12
{
    /// 

    /// An empty page that can be used on its own or navigated to within a Frame.
    /// 
    public sealed partial class Sendmail : Page
    {
        public Sendmail()
        {
            this.InitializeComponent();
        }
        private async void btnSend_Click(object sender, RoutedEventArgs e)
        {
            MailBuilder myMail = new MailBuilder();
            myMail.Html = txtMessage.Text;
            myMail.Subject = txtSubject.Text;
            myMail.To.Add(new MailBox(txtTo.Text));
            myMail.From.Add(new MailBox(txtFrom.Text));
           
            IMail email = myMail.Create();
 
            try
            {
                using (Smtp smtp = new Smtp())
                {
                    await smtp.Connect("smtp.gmail.com", 587);
                    await smtp.UseBestLoginAsync("Your Gmail ID", "Your Gmail password");
                    await smtp.SendMessageAsync(email);
                    await smtp.CloseAsync();
                    MessageDialog msg = new MessageDialog("Mail has been sucessfully sent");
                    msg.ShowAsync();
                }
            }
            catch (Exception ex)
            {
                MessageDialog msg = new MessageDialog("Error in mail send");
                msg.ShowAsync();
            }
        }  
    }
}
      

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