> 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/quarantined-email-released-to-recipients.md).
# Quarantined email released to recipients
### Synopsis
| Field | Value |
| -------------------- | ----------------------- |
| Activation Period | 14 Days |
| Training Period | 30 Days |
| Test Period | N/A (single event) |
| Deduplication Period | 1 Hour 30 Minutes |
| Required Data | Microsoft 365 Emails |
| Detection Modules | Email |
| ATT\&CK Tactic | Initial Access (TA0001) |
| ATT\&CK Technique | Phishing (T1566) |
| Severity | Informational |
### Description
This message was previously quarantined by vendor and has now been released and delivered to the intended recipients.
### Attacker's Goals
Achieve financial gain, distribute malware, or phish for sensitive information through mass unsolicited emails.
### Investigative actions
* Examine email headers to trace origins and check for signs of spoofing.
* Analyze the email content for spam indicators like suspicious links and aggressive marketing language.
* Monitor further actions taken, such as file downloads or access to potentially malicious links.
### Variations
Repeated quarantine releases to mailbox from previously quarantined sender
**Synopsis**
| Field | Value |
| ----------------- | ----------------------- |
| ATT\&CK Tactic | Initial Access (TA0001) |
| ATT\&CK Technique | Phishing (T1566) |
| Severity | Low |
**Description**
This message was previously quarantined by vendor and later released and delivered to the intended recipients, while the mailbox has received multiple quarantined messages and the sender has been quarantined several times over the past 30 days.
**Attacker's Goals**
Achieve financial gain, distribute malware, or phish for sensitive information through mass unsolicited emails.
**Investigative actions**
* Examine email headers to trace origins and check for signs of spoofing.
* Analyze the email content for spam indicators like suspicious links and aggressive marketing language.
* Monitor further actions taken, such as file downloads or access to potentially malicious links.
Repeated quarantine releases from previously quarantined sender
**Synopsis**
| Field | Value |
| ----------------- | ----------------------- |
| ATT\&CK Tactic | Initial Access (TA0001) |
| ATT\&CK Technique | Phishing (T1566) |
| Severity | Low |
**Description**
This message was previously quarantined by vendor and later released and delivered to the intended recipients, while the sender has been quarantined multiple times over the past 30 days.
**Attacker's Goals**
Achieve financial gain, distribute malware, or phish for sensitive information through mass unsolicited emails.
**Investigative actions**
* Examine email headers to trace origins and check for signs of spoofing.
* Analyze the email content for spam indicators like suspicious links and aggressive marketing language.
* Monitor further actions taken, such as file downloads or access to potentially malicious links.
Repeated quarantine-released emails received by mailbox
**Synopsis**
| Field | Value |
| ----------------- | ----------------------- |
| ATT\&CK Tactic | Initial Access (TA0001) |
| ATT\&CK Technique | Phishing (T1566) |
| Severity | Low |
**Description**
This mailbox has repeatedly received messages over the past 30 days that were quarantined by vendor and later released and delivered to the recipient.
**Attacker's Goals**
Achieve financial gain, distribute malware, or phish for sensitive information through mass unsolicited emails.
**Investigative actions**
* Examine email headers to trace origins and check for signs of spoofing.
* Analyze the email content for spam indicators like suspicious links and aggressive marketing language.
* Monitor further actions taken, such as file downloads or access to potentially malicious links.
---
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