Mass Email Async

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Net.Mail;
using System.Text;
using System.Threading.Tasks;
 
public class EmailSender 
{
    readonly string _clientAddress;
    public EmailSender(string client)
    {
        _clientAddress = client;
    }
    public void SendEmails(List<MailMessage> message)
    {
        var totalMessages = message.Count;
        var tasks = new List<Task>();
        foreach (var item in message)
        {
            tasks.Add(SendMailAsync(item));
        }
        while (tasks.Count > 0)
        {
            var idx = Task.WaitAny(tasks.ToArray());
            tasks.RemoveAt(idx);
        }
    }
    async Task SendMailAsync(MailMessage message)
    {
        await Task.Run(() =>
        {
            SendEmail(message);
        });
    }
    public void SendEmail(MailMessage message, int tryCount = 0)
    {
        try
        {
            using (var client = new SmtpClient(_clientAddress))
            {
                client.Send(message);
            }
        }
        catch(Exception)
        {
            if (tryCount > 3)
                throw;
            SendEmail(message, tryCount++);
        }
    }
 
 
}