---
title: "External Attachment Ratio"
---

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# External Attachment Ratio

## How we describe it

Proportion of emails with attachments that were sent to external recipients.

## Where this comes from

This signal is derived from Microsoft Graph: `message.hasAttachments, GET /me/sentItems`.

[Microsoft Graph documentation](https://learn.microsoft.com/en-us/graph/api/resources/message)

Source: https://docs.praxisnavigator.io/analytics/glossary/external-attachment-ratio/index.mdx