internal static void ValidateTlsSenderCertificateRestrictions(TlsCertificate certificate, MultiValuedProperty <SmtpX509IdentifierEx> ffoFDSmtpCerts, MultiValuedProperty <ServiceProviderSettings> serviceProviders, Task task)
 {
     if (certificate == null)
     {
         return;
     }
     if (!MultiValuedPropertyBase.IsNullOrEmpty(ffoFDSmtpCerts) && ffoFDSmtpCerts.Any((SmtpX509IdentifierEx ffoFDSmtpCert) => ffoFDSmtpCert.Matches(certificate)))
     {
         task.WriteError(new TlsSenderCertificateNameMatchesFfoFDSmtpCertificateException(certificate.ToString()), ErrorCategory.InvalidArgument, null);
     }
     if (!MultiValuedPropertyBase.IsNullOrEmpty(serviceProviders) && serviceProviders.Any((ServiceProviderSettings serviceProvider) => serviceProvider.Certificates != null && serviceProvider.Certificates.Any((TlsCertificate providerCertificate) => providerCertificate != null && providerCertificate.Equals(certificate))))
     {
         task.WriteError(new TlsSenderCertificateNameMatchesServiceProviderCertificateException(certificate.ToString()), ErrorCategory.InvalidArgument, null);
     }
 }