System.Net.Mail.SmtpClient.ValidateUnicodeRequirement C# (CSharp) Method

        private void ValidateUnicodeRequirement(MailMessage message, MailAddressCollection recipients, bool allowUnicode)
        {
            // Check all recipients, to, from, sender, bcc, cc, etc...
            // GetSmtpAddress will throw if !allowUnicode and the username contains non-ascii
            foreach (MailAddress address in recipients)
            {
                address.GetSmtpAddress(allowUnicode);
            }
            if (message.Sender != null)
            {
                message.Sender.GetSmtpAddress(allowUnicode);
            }
            message.From.GetSmtpAddress(allowUnicode);
        }