ASP.NET从VStudio发送电子邮件运行速度很快，但在IIS中速度很慢(ASP.NET Send email from VStudio is running fast but very slow in IIS)

 使用Visual Studio从我的ASP.NET项目发送电子邮件的速度非常快 - 它在一秒之内完成 - 但是当在同一台机器上的IIS 7中发布时，它需要50秒或更长时间。 有没有人遇到过这种速度降低？ 我已将我的C＃代码和我的设置粘贴到web.config中。 非常感谢你。 
 
public static bool EnviarMail(String eOrigen, String eDestino, String asunto, String cueMensaje)
    {
        Boolean EstadoEnvio;
        MailMessage eMail = new MailMessage();
        eMail.From = new MailAddress(eOrigen);
        eMail.To.Add(new MailAddress(eDestino));
        eMail.Subject = asunto;
        eMail.IsBodyHtml = true;
        cueMensaje = cueMensaje.Replace("\r\n", "<BR>");
        eMail.Body = cueMensaje;
        eMail.Priority = MailPriority.Normal;

        SmtpClient clienteSMTP = new SmtpClient();
        try
        {   
            clienteSMTP.Send(eMail);
            EstadoEnvio = true;
        }
        catch 
        {
            EstadoEnvio = false;
        }
        return EstadoEnvio;            
    }
 
 并在我的web.config： 
 
    <mailSettings>
        <smtp from="iso@hmoore.com.ar">
            <network host="174.120.190.6" port="25" userName="iso@hmoore.com.ar" password="-----" defaultCredentials="true"/>
        </smtp>
    </mailSettings>

To send an email from my ASP.NET project using Visual Studio is very fast--it does in one second--but when published in IIS 7 on the same machine, it takes 50 seconds or more. Has anyone encountered this reduction in speed before? I've pasted my C# code and my settings in the web.config. Thank you very much.
 
public static bool EnviarMail(String eOrigen, String eDestino, String asunto, String cueMensaje)
    {
        Boolean EstadoEnvio;
        MailMessage eMail = new MailMessage();
        eMail.From = new MailAddress(eOrigen);
        eMail.To.Add(new MailAddress(eDestino));
        eMail.Subject = asunto;
        eMail.IsBodyHtml = true;
        cueMensaje = cueMensaje.Replace("\r\n", "<BR>");
        eMail.Body = cueMensaje;
        eMail.Priority = MailPriority.Normal;

        SmtpClient clienteSMTP = new SmtpClient();
        try
        {   
            clienteSMTP.Send(eMail);
            EstadoEnvio = true;
        }
        catch 
        {
            EstadoEnvio = false;
        }
        return EstadoEnvio;            
    }
 
And in my web.config:
 
    <mailSettings>
        <smtp from="iso@hmoore.com.ar">
            <network host="174.120.190.6" port="25" userName="iso@hmoore.com.ar" password="-----" defaultCredentials="true"/>
        </smtp>
    </mailSettings>

原文：https://stackoverflow.com/questions/14399056