如何使用 MailKit 发送电子邮件?

How to send email by using MailKit?(如何使用 MailKit 发送电子邮件?)

问题描述

根据新的谷歌政治https://googleonlinesecurity.blogspot.de/2014/04/new-security-measures-will-affect-older.html 我无法发送电子邮件.对于不使用 OAuth 2.0 的应用程序，Google 会考虑不太安全的应用程序".

According to the new google politics https://googleonlinesecurity.blogspot.de/2014/04/new-security-measures-will-affect-older.html I can't sent an email. "Less secure apps" are considered for google the application which don't use OAuth 2.0.

我想用MailKit来解决这个问题

I would like to use MailKit to solve this problem

var message = new MimeMessage();

message.From.Add(new MailboxAddress("Joey Tribbiani", "noreply@localhost.com"));
message.To.Add(new MailboxAddress("Mrs. Chanandler Bong", "mymail@gmail.com"));
message.Subject = "How you doin'?";
message.Body = new TextPart("plain"){ Text = @"Hey" };

using (var client = new SmtpClient())
{
   client.Connect("smtp.gmail.com", 587);

   ////Note: only needed if the SMTP server requires authentication
   client.Authenticate("mymail@gmail.com", "mypassword");

   client.Send(message);
   client.Disconnect(true);
}

但我得到了MailKit.dll 中发生了MailKit.Security.AuthenticationException"类型的异常，但未在用户代码中处理.附加信息:身份验证失败.

我不想更改我的安全设置.因为我希望一切都安全.这就是我开始使用 MailKit 而不是 System.Net.Mail 的原因

I don't want to change my security settings. Because I want that everything will be secure. That's why I start to use MailKit rather than System.Net.Mail

我该如何解决?

推荐答案

你需要做的第一件事是遵循 Google 为您的应用程序获取 OAuth 2.0 凭据的说明.

The first thing you need to do is follow Google's instructions for obtaining OAuth 2.0 credentials for your application.

完成此操作后，获取访问令牌的最简单方法是使用 Google 的 Google.Apis.Auth 库:

Once you've done that, the easiest way to obtain an access token is to use Google's Google.Apis.Auth library:

var certificate = new X509Certificate2 (@"C:path	ocertificate.p12", "password", X509KeyStorageFlags.Exportable);
var credential = new ServiceAccountCredential (new ServiceAccountCredential
    .Initializer ("your-developer-id@developer.gserviceaccount.com") {
    // Note: other scopes can be found here: https://developers.google.com/gmail/api/auth/scopes
    Scopes = new[] { "https://mail.google.com/" },
    User = "username@gmail.com"
}.FromCertificate (certificate));

//You can also use FromPrivateKey(privateKey) where privateKey
// is the value of the field 'private_key' in your serviceName.json file

bool result = await credential.RequestAccessTokenAsync (cancel.Token);

// Note: result will be true if the access token was received successfully

现在您有了访问令牌 (credential.Token.AccessToken)，您可以将它与 MailKit 一起使用，就像它是密码一样:

Now that you have an access token (credential.Token.AccessToken), you can use it with MailKit as if it were the password:

using (var client = new SmtpClient ()) {
   client.Connect ("smtp.gmail.com", 587);

   // use the OAuth2.0 access token obtained above
   var oauth2 = new SaslMechanismOAuth2 ("mymail@gmail.com", credential.Token.AccessToken);
   client.Authenticate (oauth2);

   client.Send (message);
   client.Disconnect (true);
}

更新:

上述解决方案适用于 Google 所称的用于服务器到服务器通信的服务帐户"，但如果您希望 OAuth2 支持标准电话或桌面应用程序，例如，您需要遵循我在这里写的方向:https://github.com/jstedfast/MailKit/blob/master/GMailOAuth2.md

The above solution is for what Google refers to as "Service Accounts" that are used for server-to-server communication, but if you want OAuth2 support for standard Phone or Desktop apps, for example, you'll need to follow the directions I've written here: https://github.com/jstedfast/MailKit/blob/master/GMailOAuth2.md

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