---
title: errSecSMIMEKeyUsageNotCritical
framework: security
role: symbol
role_heading: Global Variable
path: security/errsecsmimekeyusagenotcritical
---

# errSecSMIMEKeyUsageNotCritical

The key usage extension is not marked as critical.

## Declaration

```swift
var errSecSMIMEKeyUsageNotCritical: OSStatus { get }
```