---
title: Open rate
description: Open rate measures the percentage of recipients who open an email. It’s an indicator of subject-line effectiveness and audience interest.
---

[B2B marketing glossary ](https://mixology-digital.com/glossary)

# [Open rate](https://mixology-digital.com/glossary/open-rate)

 Written by [Mixology Digital](https://mixology-digital.com/glossary/author/mixology-digital) | Nov 14, 2025 11:32:11 AM

Open rate measures the percentage of recipients who open an email. It’s an indicator of subject-line effectiveness and audience interest.

In B2B marketing, open rates help assess how well [segmentation](https://mixology-digital.com/glossary/segmentation) and timing align with recipient behaviour. Although affected by Apple Mail Privacy Protection and similar changes, open rate remains useful as a directional engagement metric when combined with [CTOR](https://mixology-digital.com/glossary/ctor) and conversion data.

[View full post](https://mixology-digital.com/glossary/open-rate)

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