Unverified50% confidenceFactExact time
Tracking pixels in email marketing are 1×1 transparent images embedded in emails; when a recipient opens the email, the image is loaded from a remote server, allowing the sender to obtain the recipient's IP address, geographic location, and open time.
1
Sources
50%
Confidence
Long-term
Relevance
8/4/2026
First Seen
Sources
苹果Mail发送非iCloud邮件时为何连接iCloud服务器？原因解析
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