HTML 电子邮件：这个 IMG 标签在预报头中做什么？
HTML Email: What is this IMG tag doing in the preheader?
我是 HTML 电子邮件开发的新手，我正试图通过剖析 HTML 电子邮件上的 HTML 电子邮件来提高我对 HTML 电子邮件结构的理解 reallygoodemails.com."
在位于此地址的示例中：“https://reallygoodemails.com/emails/craving-some-chocolate/live”，在 HTML 邮箱。
这个 IMG 标签有什么作用？
这是一个Spy Pixel。
Spy pixels or tracker pixels are hyperlinks to remote image files in HTML email messages that have the effect of spying on the person reading the email if the image is downloaded. They are commonly embedded in the HTML of an email as small, imperceptible, transparent graphic files. Spy pixels are commonly used in marketing, and there are several countermeasures in place that aim to block email tracking pixels. However, there are few regulations in place that effectively guard against email tracking approaches.
总而言之，当打开电子邮件并且浏览器加载该图像时，浏览器将查找 URL 期望的图像数据。但是，图像数据为 0 像素乘 0 像素，因此电子邮件不显示任何内容。相反，托管该“图像”的服务器知道您打开了电子邮件。因为 URL 对您的电子邮件地址是唯一的，所以他们知道您亲自打开了该电子邮件。该信息对于向发件人显示其电子邮件营销活动的执行情况很有用。
我是 HTML 电子邮件开发的新手，我正试图通过剖析 HTML 电子邮件上的 HTML 电子邮件来提高我对 HTML 电子邮件结构的理解 reallygoodemails.com."
在位于此地址的示例中：“https://reallygoodemails.com/emails/craving-some-chocolate/live”，在 HTML 邮箱。
这个 IMG 标签有什么作用？
这是一个Spy Pixel。
Spy pixels or tracker pixels are hyperlinks to remote image files in HTML email messages that have the effect of spying on the person reading the email if the image is downloaded. They are commonly embedded in the HTML of an email as small, imperceptible, transparent graphic files. Spy pixels are commonly used in marketing, and there are several countermeasures in place that aim to block email tracking pixels. However, there are few regulations in place that effectively guard against email tracking approaches.
总而言之，当打开电子邮件并且浏览器加载该图像时，浏览器将查找 URL 期望的图像数据。但是，图像数据为 0 像素乘 0 像素，因此电子邮件不显示任何内容。相反，托管该“图像”的服务器知道您打开了电子邮件。因为 URL 对您的电子邮件地址是唯一的，所以他们知道您亲自打开了该电子邮件。该信息对于向发件人显示其电子邮件营销活动的执行情况很有用。