ReadNotify 提供 Email tracking 的服務, 可以知道收件人讀信了沒, 把收件人的 Email 最後加上 .readnotify.com 即可.
說穿了只是在信的最後, 加上一段 <img src= 的 HTML code,
收件人在讀信時, 便會載入一張 1x1 的 GIF 檔, Server 端就知道這封信已經被讀取.
跟 Spammer 用來檢查 Email 是否有效的方法一樣.
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This page contains a single entry by Pank published on September 29, 2006 10:58 PM.
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