为什么在ASP.NET应用程序中使用异常的SMTPClient发送邮件失败？
我正在尝试通过SmtpClient（“ SMTP.Office365.com”）发送电子邮件，并遇到问题。
考虑以下代码段：
var fromAddress = new MailAddress("[email protected]", "TestFrom");
var toAddress = new MailAddress("[email protected]", "TestSend");
string fromPassword = "SomePassword";
var smtp = new SmtpClient
{
Host = "smtp.office365.com",
Port = 587,
EnableSsl = true,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
};
using (var message = new MailMessage(fromAddress, toAddress)
{
Subject = "Hey There Did this Test Work?",
Body = "Hey There Did this Test Work?",
IsBodyHtml = true,
})
smtp.Send(message);
此代码从.NET控制台应用程序中正常工作。 我也可以使用相同的凭据，并通过PowerShell发送电子邮件。
当我尝试在ASP.NET应用程序中使用相同的代码段时，它会失败。 我已经尝试使用本地部署的应用程序和Azure尝试了此操作。 我得到相同的结果。
我得到以下例外：
失败发送邮件。无法从运输中读取数据 连接：net_io_connectionclosed。
有人告诉我过去在过去三个月之前的某个时候正常工作。 我在这里做错了吗？我应该使用其他配置设置吗？ ASP.NET是否需要设置某些东西（本地和在Azure内部）才能工作？
谢谢
I am trying to send an email via SmtpClient ("smtp.office365.com") and am running into issues.
Consider the following code snippet:
var fromAddress = new MailAddress("[email protected]", "TestFrom");
var toAddress = new MailAddress("[email protected]", "TestSend");
string fromPassword = "SomePassword";
var smtp = new SmtpClient
{
Host = "smtp.office365.com",
Port = 587,
EnableSsl = true,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
};
using (var message = new MailMessage(fromAddress, toAddress)
{
Subject = "Hey There Did this Test Work?",
Body = "Hey There Did this Test Work?",
IsBodyHtml = true,
})
smtp.Send(message);
This code works correctly from a .Net console application.
I can also use the same credentials and send an email via PowerShell.
When I attempt to use the same code snippet in an Asp.Net application, it fails.
I've tried this with the application deployed locally and to Azure.
I get the same results.
I get the following exceptions:
Failure sending mail. Unable to read data from the transport
connection: net_io_connectionclosed.
I am told that used to work correctly at some point previous to the past 3 months.
Am I doing something wrong here? Are there additional configuration settings I should be using? Does Asp.Net require something to bet set up (locally and within Azure) in order for this to work?
Thx
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我们遇到了类似的发送电子邮件的问题，事实证明这是因为我们没有执行TLS 1.2。您可以使用以下代码来执行它：
您只需要在应用程序中一次调用一次，因此application_start回调在global.asax中是一个可能提出的位置。
We had similar issues sending emails and it turned out that it was because we weren't enforcing TLS 1.2. You can enforce it with following code:
You only need call it once in your application, so Application_Start callback in global.asax is one possible place to put it.