Email notifications

I replied to a previous post about email notifications, but never got any reply, so thought I'd start a new one, since I can't seem to get this working. I've been testing it by using it on a live demo account. I don't expect it to work via back-testing as documented.

I've tried using the email settings in ctrader and also creating a smtp client in c#, but neither works for me.

I've tried my Outlook, Icloud, Gmail and created a new Yahoo account, using their email addresses and smtp server names. I tried both the 465 and 587 ports and I always get ‘Authentication with SMTP server failed’ or ‘GeneralFailure’ status code in c# and ‘Failure sending mail’.

My code below with the current yahoo server code and user/pass removed. Any help would be appreciated.

    try
    {
        Print("C# - Attempting to email...");

        var smtpClient = new SmtpClient() 
        {
            Host = "smtp.mail.yahoo.com", // smtp-mail.outlook.com. smtp.office365.com
            Port = 465, // 465 / 587
            EnableSsl = true,
            DeliveryMethod = SmtpDeliveryMethod.Network,
            UseDefaultCredentials = false,
            Credentials = new NetworkCredential("***", "***")
        };
                
        var mailMessage = new MailMessage
        {
            From = new MailAddress(EmailAddressFrom),
            Subject = "Hello from Bot",
            Body = "Hello, this is a test email from C#."
        };

        mailMessage.To.Add(EmailAddressTo);

        smtpClient.Send(mailMessage);
        smtpClient.SendCompleted += SendCompleted;

    }
    catch (SmtpException ex)
    {
        throw new ApplicationException
        ($"C# - SmtpException has occured. Status code: {ex.StatusCode}. Msg: {ex.Message}" );
    }