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What are the best practices for A/B split testing email send times and subject line variables?

Email Marketing & Sequences · 2 saved versions

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Version 1 (Edit)

Edited by Gaurav Bhasin · Aug 23, 2026 5:32 PM

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Title snapshot

What are the best practices for A/B split testing email send times and subject line variables?

Summary snapshot
Setting statistical significance sample sizes and testing single variable changes.
Content snapshot
### A/B Testing Rule Test single variables (Subject Line A vs B) on a 20% random subscriber sample, auto-sending the winning variation to the remaining 80% after 4 hours.
Source snapshot

https://developers.google.com/search/docs

Version 1 (Original Post)

Published by Gaurav Bhasin · Aug 9, 2026 5:37 AM

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Post originally created and published to the Global Hub.

Original Title

What are the best practices for A/B split testing email send times and subject line variables?

Original Summary
Setting statistical significance sample sizes and testing single variable changes.
Original Content
### A/B Testing Rule Test single variables (Subject Line A vs B) on a 20% random subscriber sample, auto-sending the winning variation to the remaining 80% after 4 hours.
Original Sources

https://developers.google.com/search/docs