---
title: "Immutable Email Versions: Why Snapshots Beat “Latest Draft” Review"
description: "Review breaks when nobody knows which draft was approved. Immutable versions fix that with a frozen artifact and auditable history."
canonical: "https://memo.ly/blog/immutable-email-versions-why-snapshots-matter"
updated: "2026-07-31"
---

# Immutable Email Versions: Why Snapshots Beat “Latest Draft” Review

Review breaks when nobody knows which draft was approved. Immutable versions fix that with a frozen artifact and auditable history.

*Guide · 7 min read · Updated 2026-07-31*

“Approved” without a version number is a story, not a record. Immutable versions turn approval into an object you can export, test, and defend later.

## Snapshot vs live edit

Editors keep working on the latest canvas. Reviewers sign off on a numbered version. Export pulls from approved snapshots - see [Create immutable versions](https://memo.ly/docs/create-immutable-versions.md).

## Request changes without losing history

Requested changes create a new version upstream. You can always answer what changed between v2 and v3 because history is append-only.

## Pair with preflight and export gates

Gates attach to the snapshot: preflight on compiled output, approval recorded, then [export](https://memo.ly/docs/export-approved-email-output.md).

## FAQ

### Can I edit an approved version?

No - approved versions stay frozen. New edits become a new version requiring review.

### How is this different from undo history?

Undo is for drafting. Versions are for collaboration and handoff with named decisions.

### Do versions store HTML?

Versions capture the compiled artifact used for review and export - not a vague “saved draft” label.

### What if only one person is on the team?

Still useful - future you is also a collaborator who forgot what “final v2” meant.

## Related
- [Glossary: Immutable version](https://memo.ly/glossary/immutable-version.md)

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