---
title: "Preflight"
description: "A deterministic, server-authoritative quality engine that checks compiled email output and gates approval, export, and test send."
canonical: "https://memo.ly/glossary/preflight"
---

# Preflight

A deterministic, server-authoritative quality engine that checks compiled email output and gates approval, export, and test send.

## Why it matters

Preflight catches the small problems - broken links, unresolved variables, missing alt text - before they reach a recipient.

## Example

Preflight blocks export until a missing image alt attribute is added.

## See also

- [quality-profile](https://memo.ly/glossary/quality-profile.md)
- [email-intent](https://memo.ly/glossary/email-intent.md)

## Related
- [Understand Email Preflight](https://memo.ly/docs/understand-email-preflight.md)
- [The email preflight checklist](https://memo.ly/email-preflight-checklist.md)

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