部署到主机后，无法通过C＃和gmail发送邮件 [英] Sending mail through C# with gmail is not working after deploying to host
问题描述
我正在尝试通过Gmail发送邮件。在localhost上进行测试时，我已经成功发送了邮件，但是当我将其上传到Web主机时，此操作不起作用。我看到这种类型的错误：
I am trying to send mail through Gmail. I am sending mail successfully when I am testing on localhost, but this does not work when I upload it to a web host. I am seeing this type of error:
请求类型System.Net.Mail.SmtpPermission，System，Version = 4.0的许可。 0.0，Culture = neutral，PublicKeyToken = b77a5c561934e089失败。
Request for the permission of type System.Net.Mail.SmtpPermission, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.
每当我使用端口25时，都会出现以下错误：
Whenever I am using port 25 get this type of error below:
SMTP服务器需要安全连接或客户端未通过身份验证。服务器响应为：5.5.1需要身份验证
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required
下面是我的发送电子邮件代码。
Below is my code of send email.
MailMessage mail = new MailMessage("host@gmail.com","User@gamil.com");
SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
mail.Subject = "Any String"
mail.Body = mailbody;
mail.IsBodyHtml = true;
SmtpServer.Port = 587;
SmtpServer.DeliveryMethod = SmtpDeliveryMethod.Network;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.Credentials = new System.Net.NetworkCredential("xyz@gmail.com","123");
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);
有什么解决方案吗？请向我建议！
Is there any solution? Please suggest to me!
推荐答案
编辑： OP添加了对回答此问题至关重要的其他信息，但是我会保留旧的答案，因为它仍然可以帮助某人
OP Added extra information crucial to answering this question, but I'm keeping the old answer around as it might still help someone
新答案：
此 StackOverflow问题已经回答了该问题
New Answer: This StackOverflow question already answered this question
OldAnswer：
作为此 StackOverflow答案已经回答，您将SMTP服务器上的端口更改为 587 而不是其默认值（ 25 ），这需要提升的权限，导致此错误的更改如下：
OldAnswer:
As this StackOverflow answer already answered, you changed the Port on the SMTP Server to 587 instead of its default (25) and this requires elevated permissions causing this error change this:
SmtpServer.Port = 587;
为此：
SmtpServer.Port = 25;
它应该可以工作
>注意：使用SSL时，端口必须为 443
Note: When using SSL the port needs to be 443
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