将附件内联/嵌入到电子邮件中会导致垃圾邮件吗？这是真的吗？
当发送一对一或交易电子邮件（即验证电子邮件）时，我们可以包含内嵌/嵌入式附件吗？这是在电子邮件顶部显示我们徽标的图像（当然是 HTML 格式）。
我在线阅读了几篇文章，特别是这篇文章：
http://ask.metafilter.com/84579/Creating-a-graphic-email-signature-without-attachment
也就是说，包含嵌入图像可能会导致将电子邮件标记为 垃圾邮件。这就是为什么我从第三方服务收到的大多数验证电子邮件根本不包含任何图像，只有纯文本甚至 HTML 文本的原因吗？
When sending out one-to-one or transactional emails (i.e. verification emails), can we include an inline / embedded attachment. Which is an image that displays our logo on the top of the email (HTML format of course).
I've read a few articles online, in particular this one:
http://ask.metafilter.com/84579/Creating-a-graphic-email-signature-without-attachment
Which says, that including embedded images could result in marking the email as spam. Is this why most verification emails I receive from third party services, don't include any images at all, just plain or even just HTML text?
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这基本上取决于您的验证电子邮件的长度。有一些垃圾邮件过滤器会检查文本与图像的比率，因为有许多垃圾邮件仅由一个短句和包含垃圾邮件有效负载的附加或内嵌图像组成（它们试图以这种方式绕过文本内容过滤器）。
此外，有些系统会计算具有相同哈希值的附件数量，如果您将其中许多附件发送到同一服务器，则将您的邮件标记为垃圾邮件。因此，它通常更安全，而不是不附加图像（无论如何都不会在某些电子邮件客户端上显示）。
it basically depends on how long your verification email is. there are spamfilters that check the text-to-image ratio since there are many spams that just consist of one short sentence and an attached or inline image which contains the spammy payload (they try to bypass the text content filter that way).
also, there are systems that count the number of attachments with the same hash and mark your message as spam if you send to many of those to the same server. therefore its generally safer not no attach images (which won't be displayed on some email clients anyway).