Send an email without having to enable less secure apps in google

Question

I made an e-mailer in C#, but you have to enable less secure apps in google. Is there a way around this? If not, how do other apps send e-mails securely without being classified as a less-secure app?

private void SendButton_Click(object sender, EventArgs e) {
       try {
           SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");

           mail.From = new MailAddress(myUsername);
           mail.To.Add(RecipientEmailBox.Text);
           mail.Subject = SubjectField.Text;
           mail.Body = MessageField.Text;

           SmtpServer.Port = 587;
           SmtpServer.Credentials = new 
           System.Net.NetworkCredential(myUsername, Login.password);
           SmtpServer.EnableSsl = true;

           SmtpServer.Send(mail);
           MessageBox.Show("Message Sent!");

       } catch (Exception ex) {
           MessageBox.Show(ex.ToString());
       }
}

I tried researching ways to get around this, but I couldn't find anything.

You could use a different SMTP server, for example, Yahoo. They may not require that step. — WhiteFire356, Oct 29 '19 at 02:12
Can you advise where you see that you need to enable "less secure apps"? — ProgrammingLlama, Oct 29 '19 at 02:14
@John there is a google setting that allows less secure apps to authenticate with your email. If I don't allow this, I get an error. — SpencerLS, Oct 29 '19 at 02:17
It looks like you can sign in with OAuth and use it for SMTP. See [here](https://developers.google.com/gmail/imap/xoauth2-protocol#smtp_protocol_exchange). I'm not sure how this works from C#, however. — ProgrammingLlama, Oct 29 '19 at 02:19
@John I can't figure out how to sign in with OAuth in C# either... — SpencerLS, Oct 29 '19 at 02:35
Maybe [this question](https://stackoverflow.com/questions/24195508/smtp-and-oauth-2) will help, although it does require using MailKit. — ProgrammingLlama, Oct 29 '19 at 02:37
@John I have been trying for hours, and I have no idea how to implement that stuff, even with mailkit. — SpencerLS, Oct 29 '19 at 22:35
Oh, awesome. You should add an answer here on how you did it. I'm sure it will be useful to someone in future! :) Sorry I couldn't be of more help, but it's not really something I've done. — ProgrammingLlama, Oct 30 '19 at 01:43

score 2 · Answer 1 · answered Jun 21 '22 at 22:23

You can no longer configure your Google account to allow connections from less secure apps, since Google disabled that option starting May 30 2022. You have to generate an application password for your Google account.

First go to https://myaccount.google.com/security and enable 2 step verification. Once you've done that, go to 'app passwords' and generate an application password for the mail app to use on a windows computer. It will display you new app password on a yellow box, use it as your Login.password

score 1 · Accepted Answer · answered Apr 14 '20 at 14:00

1

I think this is answer for question.

You can use the Google OAuth API with C#. For how to do, read the guide.

answered Apr 14 '20 at 14:00

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