> For the complete documentation index, see [llms.txt](https://cortex-docs.paloaltonetworks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cortex-docs.paloaltonetworks.com/analytics-alerts/alerts-by-name/rarely-seen-sender-address-in-the-organization.md).

# Rarely seen sender address in the organization

### Synopsis

| Field                | Value                                              |
| -------------------- | -------------------------------------------------- |
| Activation Period    | 14 Days                                            |
| Training Period      | 30 Days                                            |
| Test Period          | N/A (single event)                                 |
| Deduplication Period | 1 Day                                              |
| Required Data        | Microsoft 365 Emails                               |
| Detection Modules    | Email                                              |
| ATT\&CK Tactic       | Reconnaissance (TA0043), Initial Access (TA0001)   |
| ATT\&CK Technique    | Phishing for Information (T1598), Phishing (T1566) |
| Severity             | Informational                                      |

### Description

An email was received from a sender that has not been observed in the organization in the last 30 days.

### Attacker's Goals

Aim to steal sensitive information

* Trick recipients into downloading harmful payloads
* Aim to gain unauthorized access to the organization's systems.

### Investigative actions

* Check the email address for any unusual spellings, missing letters, or unknown domains.
* If the message contains attachments or links, scrutinize them for any suspicious indications.
* Monitor further actions taken, such as file downloads or access to potentially malicious links.


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