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# MEExtensionViewController

An object that manages a view for compose session and message security handlers.

```
class MEExtensionViewController
```

## Overview

Create a custom subclass of [`MEExtensionViewController`](/documentation/MailKit/MEExtensionViewController) to provide MailKit with a view that displays:

- Additional configuration options in a Mail compose window
- Details about the user who signed a digitally signed email message

## Relationships

### Conforms To

[`Hashable`](/documentation/Swift/Hashable)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`NSStandardKeyBindingResponding`](/documentation/AppKit/NSStandardKeyBindingResponding)

[`NSEditor`](/documentation/AppKit/NSEditor)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`NSExtensionRequestHandling`](/documentation/Foundation/NSExtensionRequestHandling)

[`NSTouchBarProvider`](/documentation/AppKit/NSTouchBarProvider)

[`NSUserInterfaceItemIdentification`](/documentation/AppKit/NSUserInterfaceItemIdentification)

[`Equatable`](/documentation/Swift/Equatable)

[`CVarArg`](/documentation/Swift/CVarArg)

[`NSSeguePerforming`](/documentation/AppKit/NSSeguePerforming)

[`NSUserActivityRestoring`](/documentation/AppKit/NSUserActivityRestoring)

[`NSCoding`](/documentation/Foundation/NSCoding)

### Inherits From

[`NSViewController`](/documentation/AppKit/NSViewController)

---

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