我可以在调用client.Send()之前测试SmtpClient吗？

using System;
using System.Net.Mail;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        try
        {
            SmtpClient client = new SmtpClient("smtp.example.com", 587);
            client.Credentials = new NetworkCredential("username", "password");
            client.EnableSsl = true;

            MailMessage message = new MailMessage("from@example.com", "to@example.com", "Test subject", "Test body");

            await client.SendMailAsync(message);

            Console.WriteLine("Email sent successfully.");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Error sending email: {ex.Message}");
        }
    }
}