Send Email using Gmail in C# from Windows Store Apps - XAML - UWP¶

In previous section, I introduced how to send email over SSL connection. In this section, I will introduce how to use your Gmail account to send email in C#.

Sections:

Introduction
Gmail App Password
[C# - Send email using Gmail account over SSL connection on 465 port]
[C# - Send email using Gmail account over TLS connection on 587 port]
Gmail SMTP OAUTH

Introduction¶

Gmail SMTP server address is smtp.gmail.com. It requires implicit SSL or explicit SSL (TLS) connection, and you should use your Gmail email address as the user name for ESMTP authentication.

Server	Port	SSL/TLS
smtp.gmail.com	25, 587	TLS
smtp.gmail.com	465	SSL

Gmail App Password¶

To help keep your account secure, starting May 30, 2022, Google will no longer support the use of third-party apps or devices which ask you to sign in to your Google Account using only your username and password.

Therefore, you should sign in using App Passwords. An App Password is a 16-digit passcode that gives a less secure app or device permission to access your Google Account. App Passwords can only be used with accounts that have 2-Step Verification turned on. You need to use App Password instead of the user password for user authentication.

Another solution is Gmail OAUH, please see Gmail SMTP OAUTH section.

Note

Remarks: All of samples in this section are based on first section: Send email in A simple C# XAML Windows Store App project. To compile and run the following example codes successfully, please click here to learn how to create the test project and add reference of EASendMail to your project.

[C# - Send email using Gmail account over SSL connection on 465 port]¶

The following example codes demonstrate how to use EASendMail SMTP component to send email using Gmail account.

Note

To get the full sample projects, please refer to Samples section.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
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;

// Add EASendMail and Tasks Namespace
using System.Threading.Tasks;
using EASendMail;

namespace CSharp_Windows_Store_App
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        }

        private async void btnSend_Click(object sender, RoutedEventArgs e)
        {
            btnSend.IsEnabled = false;
            await Send_Email();
            btnSend.IsEnabled = true;
        }

        private async Task Send_Email()
        {
            String Result = "";
            try
            {
                SmtpMail oMail = new SmtpMail("TryIt");
                SmtpClient oSmtp = new SmtpClient();

                // Set your gmail email address
                oMail.From = new MailAddress("gmailid@gmail.com");

                // Add recipient email address, please change it to yours
                oMail.To.Add(new MailAddress("support@emailarchitect.net"));

                // Set email subject and email body text
                oMail.Subject = "test email from C# XAML project";
                oMail.TextBody = "this is a test email sent from Windows Store App using Gmail.";

                // Gmail SMTP server
                SmtpServer oServer = new SmtpServer("smtp.gmail.com");

                // User and password for ESMTP authentication
                oServer.User = "gmailid@gmail.com";

                // Create app password in Google account
                // https://support.google.com/accounts/answer/185833?hl=en
                oServer.Password = "your app password";

                // Use 465 port
                oServer.Port = 465;
                oServer.ConnectType = SmtpConnectType.ConnectSSLAuto;

                await oSmtp.SendMailAsync(oServer, oMail);
                Result = "Email was sent successfully!";
            }
            catch (Exception ep)
            {
                Result = String.Format("Failed to send email with the following error: {0}", ep.Message);
            }

            // Display Result by Diaglog box
            Windows.UI.Popups.MessageDialog dlg = new
                Windows.UI.Popups.MessageDialog(Result);

            await dlg.ShowAsync();
        }
    }
}

[C# - Send email using Gmail account over TLS connection on 587 port]¶

The following example codes demonstrate how to use EASendMail SMTP component to send email using Gmail account.

Note

To get the full sample projects, please refer to Samples section.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
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;

// Add EASendMail and Tasks Namespace
using System.Threading.Tasks;
using EASendMail;

namespace CSharp_Windows_Store_App
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        }

        private async void btnSend_Click(object sender, RoutedEventArgs e)
        {
            btnSend.IsEnabled = false;
            await Send_Email();
            btnSend.IsEnabled = true;
        }

        private async Task Send_Email()
        {
            String Result = "";
            try
            {
                SmtpMail oMail = new SmtpMail("TryIt");
                SmtpClient oSmtp = new SmtpClient();

                // Set your gmail email address
                oMail.From = new MailAddress("gmailid@gmail.com");

                // Add recipient email address, please change it to yours
                oMail.To.Add(new MailAddress("support@emailarchitect.net"));

                // Set email subject and email body text
                oMail.Subject = "test email from C# XAML project";
                oMail.TextBody = "this is a test email sent from Windows Store App using Gmail.";

                // Gmail SMTP server
                SmtpServer oServer = new SmtpServer("smtp.gmail.com");

                // User and password for ESMTP authentication
                oServer.User = "gmailid@gmail.com";

                // Create app password in Google account
                // https://support.google.com/accounts/answer/185833?hl=en
                oServer.Password = "your app password";

                // Use 587 port
                oServer.Port = 587;
                oServer.ConnectType = SmtpConnectType.ConnectSSLAuto;

                await oSmtp.SendMailAsync(oServer, oMail);
                Result = "Email was sent successfully!";
            }
            catch (Exception ep)
            {
                Result = String.Format("Failed to send email with the following error: {0}", ep.Message);
            }

            // Display Result by Diaglog box
            Windows.UI.Popups.MessageDialog dlg = new
                Windows.UI.Popups.MessageDialog(Result);

            await dlg.ShowAsync();
        }
    }
}

Gmail SMTP OAUTH¶

The Gmail IMAP and SMTP servers have been extended to support authorization via the industry-standard OAuth 2.0 protocol. Using OAUTH protocol, user can do authentication by Gmail Web OAuth instead of inputting user and password directly in application. This way is more secure, but a little bit complex.

Using Gmail SMTP OAUTH

Next Section

At next section I will introduce how to send email with Yahoo account.

Tutorial Index

Send Email using Gmail in C# from Windows Store Apps - XAML - UWP¶

Introduction¶

Gmail App Password¶

[C# - Send email using Gmail account over SSL connection on 465 port]¶

[C# - Send email using Gmail account over TLS connection on 587 port]¶

Gmail SMTP OAUTH¶

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