无法在 .NET 中发送邮件请求

问：

当我尝试从我的 asp.net 发送邮件时，Web 表单无法发送。尝试调试时，出现超时问题。实际上，去年它运行良好。但目前它不起作用，我不知道这段代码会发生什么。 这是我的 ASPX.cs 代码

public static void SendByMail(string responseBody, string Subject)
{
    try
    {
        MailMessage message = new MailMessage();
        message.From = new MailAddress("[email protected]", "abcd.com");
        message.To.Add(new MailAddress("[email protected]"));
        message.Subject = Subject;
        message.Body = responseBody;
        message.IsBodyHtml = true;
        message.Priority = MailPriority.High;

        SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
        client.UseDefaultCredentials = false;
        NetworkCredential myCreds = new NetworkCredential("[email protected]", "password", ""); 
        client.Credentials = myCreds;

        client.EnableSsl = true;
        client.Send(message);
    }
    catch //(Exception ex)
    {
        throw new Exception(ex.Message, ex.InnerException);
    }
}