使用Office 365的极慢的SmtpClient

I'm working on MVC5 website. This website contains "contact us" form where user can contact website support.

我正在研究MVC5网站。本网站包含“联系我们”表格，用户可以联系网站支持。

The problem is that the SendMailAsync takes at least 10-13 seconds to complete (no attachments) and while this process is running, user is stuck and waiting for the response from the server - whether the email was sent successfully or not.

问题是SendMailAsync至少需要10-13秒才能完成（没有附件），当此过程正在运行时，用户会卡住并等待来自服务器的响应 - 无论电子邮件是否成功发送。

This is my current ActionResult method:

这是我当前的ActionResult方法：

[HttpPost]
public async Task<ActionResult> Contact(MessageModel Model)
{
    //...
    await SendMessage(Model);
    //...
    return View();
}

And this is my method responsible for sending the email:

这是我负责发送电子邮件的方法：

private async Task SendMessage(MessageModel Model)
{
    var Message = new MailMessage();
    Message.From = ...;
    Message.To.Add(...);
    Message.Subject = ...;
    Message.IsBodyHtml = true;

    SmtpClient Client = new SmtpClient();
    Client.UseDefaultCredentials = false;
    Client.Credentials = ...;
    Client.Port = 587;
    Client.Host = "smtp.office365.com";
    Client.DeliveryMethod = SmtpDeliveryMethod.Network;
    Client.EnableSsl = true;

    await Client.SendMailAsync(Message);
}

Are there any faster working alternatives? I could run it like this:

有没有更快的工作替代品？我可以像这样运行它：

await Task.Factory.StartNew(() => SendMessage(Model));

The website would not be "stuck" for 13 seconds and response would be instantaneous, however, I would not be able too provide the user with information whether the email was sent successfully or not.

该网站不会被“卡住”13秒并且响应将是即时的，但是，我无法向用户提供有关电子邮件是否成功发送的信息。

1 个解决方案

#1

We ran into similar problems recently for an event registration, 4-5 sec for each email, and we needed to send multiple with different content. The client's IT person was able to get a .protection.outlook.com:25 server accepting non ssl traffic running on the same domain and it took the time to 1-1.5 sec. Which was fast enough for the client with some UI to show we were processing. We also tried a local server and it was only about 100ms, but they didn't want to have that email service running on their DC.

我们最近遇到了类似的问题，每个电子邮件发送一次事件，每个电子邮件需要4-5秒，我们需要发送多个不同的内容。客户的IT人员能够获得.protection.outlook.com：25服务器接受在同一域上运行的非ssl流量，并且花费的时间为1-1.5秒。这对于客户端而言足够快，其中一些UI显示我们正在处理。我们还尝试了本地服务器，它只有大约100毫秒，但他们不希望在他们的DC上运行该电子邮件服务。

I can't speak to the specifics of the setup for this .protection.outlook.com server since I wasn't involved, but it may be something to look into if you don't want to rely on async.

我不能谈论这个.protection.outlook.com服务器的设置细节，因为我没有参与，但如果你不想依赖异步，可能需要考虑一下。