Asp.Net Core MailKit: Remote certificate is invalid according to validation procedure

I have a question regarding sending email on asp.net core.

So, I have this code:

private void SendEmailLocalSMTP(string email, string subject, string message)
{
        MimeMessage mailMsg = new MimeMessage();

        //TESTING ENVIRONMENT ONLY!!!
        mailMsg.To.Add(new MailboxAddress("myMail@gmail.com", "cjimenezber@gmail.com"));

        // From
        mailMsg.From.Add(new MailboxAddress("noreply@app.com", "Facturacion"));

        // Subject and multipart/alternative Body
        mailMsg.Subject = subject;
        string html = message;

        System.Net.NetworkCredential credentials = new System.Net.NetworkCredential("myMail@gmail.com", "myPassword");

        // Init SmtpClient and send
        using (var client = new SmtpClient())
        {
            client.Connect("smtp.gmail.com", 587, SecureSocketOptions.StartTls);
            client.AuthenticationMechanisms.Remove("XOAUTH2");
            client.Authenticate(credentials);
            client.Send(mailMsg);
            client.Disconnect(true);
        }
    }

      

        
        
        
      

    

From what I've found in other posts related to it, this should be enough to send it using MailKit, however it doesn't work as expected. I am getting the following exception and I have no idea how to proceed from here.

This is an exception:

I saw this question, but I didn't make any sense to it: How to send an email using MailKit?

Any help is greatly appreciated, thanks.