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NURO Growth
Since 2009
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Email

Open rate

Percentage of recipients who open an email.

Increasingly unreliable after Apple Mail Privacy Protection inflates opens via pre-fetch. Use click-through rate, click-to-open rate, and revenue per recipient as truer signals. Subject line tests still drive measurable lift in 2026 inbox view rates.

More in Email
Click-to-open rate (CTOR)
Clicks divided by opens. Measures email body quality.
Deliverability
Whether your emails actually reach the inbox versus spam.
SPF / DKIM / DMARC
Email authentication DNS records that prove you are who you say you are.
Email flow
Automated email sequence triggered by a customer action.
List segmentation
Dividing your email list into targeted subgroups.
Double opt-in
Email subscription that requires confirmation via clicked link.

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