What are best practices for using SmtpClient, SendAsync and Dispose under .NET 4.0

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The original question was asked for .NET 4, but if it helps as of .NET 4.5 SmtpClient implements async awaitable method
SendMailAsync.

As a result, to send email asynchronously is as the following:

public async Task SendEmail(string toEmailAddress, string emailSubject, string emailMessage)
{
    using (var message = new MailMessage())
    {
        message.To.Add(toEmailAddress);

        message.Subject = emailSubject;
        message.Body = emailMessage;

        using (var smtpClient = new SmtpClient())
        {
            await smtpClient.SendMailAsync(message);
        }
    }
}

It’s better to avoid using SendAsync method.

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