# Each domain has a malware filter policy applied to it, or the default policy is being used
Exchange Online Protection malware filter policies are applied using rules. The default policy applies in the absence of a custom policy.
Source: https://maester.dev/docs/tests/ORCA.232
Part of ORCA · Defender · Anti-malware · All checks
```powershell title="Run this check"
Invoke-Maester -TestId ORCA.232
```
## Overview
Exchange Online Protection malware filter policies are applied using rules. The default policy applies in the absence of a custom policy. When creating custom policies, there may be duplication of settings and depending on the rules and priority, some policies or settings may not even apply. It's important in this circumstance to check that the desired settings are applied to the right users.
#### Remediation action
Check your malware filter policies for duplicate rules. Some policies and settings may not be applying.
#### Related Links
* [Microsoft 365 Defender Portal - Anti-malware policies](https://security.microsoft.com/antimalwarev2)
* [Order and precedence of email protection](https://aka.ms/orca-atpp-docs-4)
## Details
Every attribute of this check
| Field | Value |
| --- | --- |
| Test ID | ORCA.232 |
| Severity | Low |
| Suite | ORCA |
| Product | Defender |
| Related products | Exchange Online |
| Feature | Anti-malware |
| Area | Email and collaboration protection |
| Resource type | Domain |
| User impact | Low |
| Implementation cost | Low |
| MITRE ATT&CK | None |
| Supports controls | nist-800-53-r5:SI-3 |
| PowerShell test | [Test-ORCA232](https://github.com/maester365/maester/blob/main/tests/orca/Test.ORCA.232.ps1) |
| Services | ExchangeOnline |
## Source
- Test: [`tests/orca/Test.ORCA.232.ps1`](https://github.com/maester365/maester/blob/main/tests/orca/Test.ORCA.232.ps1)
- Documentation: [`tests/orca/Test.ORCA.232.md`](https://github.com/maester365/maester/blob/main/tests/orca/Test.ORCA.232.md)
