如何检测电子邮件是否已被收件人视为垃圾邮件而拒绝？
有没有办法检查发送的电子邮件是否已被标记为垃圾邮件或已删除？
我使用 Rails 3。
Is there a way to check if a sent e-mail has been marked as spam or deleted?
I work with Rails 3.
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不，没有。当您的邮件发送到收件人的 SMTP 服务器后，就无法再对其进行追踪。
我知道您在想什么：一些邮件客户端如何追踪电子邮件是否已被阅读（例如在 Outlook 中）。他们可以通过在邮件 (html) 中添加一点
img标签来实现此目的。当用户打开邮件时，它将打开img的src属性中指定的路径。由于这是一个脚本（例如 PHP 或其他脚本），因此当邮件被打开时，它可以自动将标志设置为“已读”。当然，还有其他一些方法可以追踪这一点，但我认为这是最受欢迎的一种。
但是，这无法检查邮件是否已被拒绝、删除或移动到垃圾邮件文件夹。
No, there isn't. After your mail has been sent to your receiver's SMTP server, there's no way to track it down anymore.
I know what you're thinking: how can some mail-clients track down wether an email has been read or not (e.g. in Outlook). They can do this by adding a little
img-tag to their mails (html). When a user opens the mail, it'll open the path specified in theimg'ssrc-attribute. Since that's a script (like PHP or something), it can automatically sets a flag to 'seen' when a mail has been opened.Of course, there are some other ways to track this down, but I think this is the most popular one.
However, this can't be done to check whether a mail has been rejected, deleted or moved to the spam-folder.