Sending email with smtp while two factor enable

Question

HI,

I am sending email with smtp in my web application recently IT departement enable two factor authentication for the emails. After that email sending start failing with error "Failure sending Email".

So i want to know what should we need to do to send email when two factor authentications enable.
Application is in WebForms and .net 4

Here is my current code.

public string SendEmail(string ToList, string CCList, string BCCList, string Subject, string MessageBody)
{
    try
    {
        System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();

        mail.BodyEncoding = System.Text.Encoding.UTF8;
        mail.HeadersEncoding = System.Text.Encoding.UTF8;
        mail.SubjectEncoding = System.Text.Encoding.UTF8;

        // To List
        addEmailAddress(ToList, ref mail);

        //CC List
        addEmailAddress(CCList, ref mail);

        //BCC List
        addEmailAddress(BCCList, ref mail);

        mail.From = new System.Net.Mail.MailAddress(email, displayName);
        mail.Subject = Subject;

        mail.Body = MessageBody;
        mail.Priority = System.Net.Mail.MailPriority.High;
        mail.IsBodyHtml = true;

        System.Net.Mail.SmtpClient Smtp = new System.Net.Mail.SmtpClient(smtpMailServer);
        Smtp.EnableSsl = enableSsl;
        //Smtp.UseDefaultCredentials = false;

        Smtp.Credentials = new System.Net.NetworkCredential(email, password);
        Smtp.Send(mail);

        log.Debug(userName + ": CommonFunction SendEmail_1 end with OK status");
        return "OK";
    }
    catch (Exception exc)
    {
        log.Error(userName + ": Exception in CommonFunction SendEmail_1: " + exc.StackTrace.ToString());
        log.Error(userName + ": Exception in CommonFunction SendEmail_1: " + exc.Message.ToString());
        throw new Exception(exc.Message);
    }
}

Answer 1

Hi @Shahid Majeed ,
If you’re using Microsoft Outlook with the two-step verification (2FA) turned on, you’ll need to:

1. Go to the Security basics page and sign in to your Microsoft account.
2. Select more security options.
3. Under App passwords, select Create a new app password. A new app password is generated and appears on your screen.
4. Enter this app password where you would enter your normal password along with regular Outlook SMTP/IMAP settings: IMAP: imap-mail.outlook.com
   Port: 993
   SMTP: smtp-mail.outlook.com
   Port: 587
   With this setup you will be able to use your Microsoft Outlook account in Growbots!
   Best regards,
   Yijing Sun

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