---
updatedAt: 2026-04-10T19:31:18.000Z
agentTools:
  projectIndex: https://docs.fullcontact.com/llms.txt
---

# Email Hash Activity

The Email Hash Activity Insights Add-On will return additional insights for the hashed versions of known email addresses associated with the profile including first seen and last seen timestamps along with an associated activity score of `HIGH`, `MEDIUM` or `LOW`. The returned hashed email addresses and associated insights can then be used as identity verification and fraud signals or for enhanced marketing activation efforts. The max number of hashed email addresses that can be returned are 20.  This Insights will be returned within the `emails` key in the `details` object of a Person Summary object.

<br />

```json
"details": {
"emails": [
{
"label": "Other",
"md5": "bbbe3f5df1bf8d823058ba60addfa7f5",
"sha256": "12ca252e3570e9f88468e8b30b247d1c5cb38827f3d5cacf4b35cd6130edf899",
"sha1": "a3fd93ec1eed8cb245c99701f9107686ca9b40f9"
"firstSeen": "2009-01-01",
"lastSeen": "2021-12-27",
"activity": "HIGH"
},
...
]
},
```

<table class="properties-list">
  <thead>
    <tr>
      <th colspan="2">Properties</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>
        label
        <span class="properties-list-type">string</span>
      </td>
 <td>
    An indicator of the source or type of email. If provided in the Person request, the value will be <code>provided</code>, otherwise, <code>hash</code>.
  </td>
</tr>

<tr>
  <td>
    md5
    <span class="properties-list-type">string</span>
  </td>

  <td>
    The MD5 hash representation for a given email address.
  </td>
</tr>

<tr>
  <td>
    sha1
    <span class="properties-list-type">string</span>
  </td>

  <td>
    The SHA-1 hash representation for a given email address.
  </td>
</tr>

<tr>
  <td>
    sha256
    <span class="properties-list-type">string</span>
  </td>

  <td>
    The SHA-256 hash representation for a given email address.
  </td>
</tr>

<tr>
  <td>
    firstSeen
    <span class="properties-list-type">string</span>
  </td>

  <td>
    The timestamp (YYYY-MM-DD) of the first time FullContact has seen a given email address.
  </td>
</tr>

<tr>
  <td>
    lastSeen
    <span class="properties-list-type">string</span>
  </td>

  <td>
    The timestamp (YYYY-MM-DD) of the last time FullContact has seen a given email address.
  </td>
</tr>

<tr>
  <td>
    activityScore
    <span class="properties-list-type">string</span>
  </td>

  <td>
    An associated activity score (HIGH, MEDIUM, LOW) for a given email address based on events such as number or observances, number of sources, etc.
  </td>
</tr>

  </tbody>
</table>

<br />