public SmtpConnection(SmtpConnectionOptions options)
     : base(options.Host, options.Port, false, options.AllowInvalidRemoteCertificates)
 {
     _options       = options;
     ConnectionType = _options.ConnectionType;
     ComputeDefaultValues();
 }
 public SmtpConnection(SmtpConnectionOptions options)
     : base(options.Host, options.Port, false, options.AllowInvalidRemoteCertificates)
 {
     _options       = options ?? throw new ArgumentNullException(nameof(options));
     ConnectionType = _options.ConnectionType;
     ComputeDefaultValues();
 }