Email Open Rate: What It Tells You

Open rate can indicate whether messages are being opened, but privacy protections and automated image loading make it an imperfect behavioral signal.

Updated September 2026

What open rate measures

At a basic level, open rate is the share of delivered messages recorded as opened. Tracking generally relies on a tiny image request, which is why privacy and client behavior can affect the measurement.

Why the number is imperfect

Some email clients can preload tracking images, while other users block them. Treat open rate as directional rather than a precise count of human attention.

Use it in context

Compare trends within your own list and campaign types. Pair opens with clicks, replies, conversions or other outcomes that are closer to the purpose of the email.

Improve the underlying experience

Focus on permission, relevance, recognizable sending identity and subject lines that accurately represent the message.