Send e-mail validating self-signed SSL certificate

ValidateSelfSignedCertificate.cs

// Copyright 2019 Caio Proiete & Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.using System;

using System;
using System.Net;
using System.Net.Mail;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;

namespace ValidateSelfSignedSslCertificate
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;

                using (var smtpClient = new SmtpClient("mail.caioproiete.net", 25))
                {
                    var msg = new MailMessage(
                        from: "do-not-spam-me@caioproiete.net",
                        to: "do-not-spam-me-either@caioproiete.net",
                        subject: "Test",
                        body: "This is a test :)");

                    smtpClient.EnableSsl = true;
                    smtpClient.Send(msg);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(ex.ToString());
            }
        }

        private static bool CertificateValidationCallBack(object sender, X509Certificate certificate, X509Chain chain,
            SslPolicyErrors sslPolicyErrors)
        {
            if (sslPolicyErrors == SslPolicyErrors.None)
            {
                return true;
            }

            // Uncomment the below to debug errors (better yet, you should be logging these errors):

            //Console.WriteLine("Subject: " + certificate.Subject);
            //Console.WriteLine("Issuer: " + certificate.Issuer);
            //Console.WriteLine("---");
            //
            //if ((sslPolicyErrors & SslPolicyErrors.RemoteCertificateChainErrors) != 0 && chain != null)
            //{
            //    foreach (var status in chain.ChainStatus)
            //    {
            //        Console.WriteLine("Subject: " + certificate.Subject);
            //        Console.WriteLine("Issuer: " + certificate.Issuer);
            //        Console.WriteLine("Status: " + status.Status);
            //        Console.WriteLine("StatusInformation: " + status.StatusInformation);
            //        Console.WriteLine("---");
            //    }
            //}

            return false;
        }
    }
}