## set_ContainsHeaderStrings {#set_containsheaderstrings}

Sets the strings that appear in the headers of incoming messages in order for the condition or exception to apply.

**Returns:** void Aspose::Email::Clients::Exchange::

```cpp
set_ContainsHeaderStrings(System::SharedPtr < System::Collections::Specialized::StringCollection > value)
```

| Parameter | Description |
| --- | --- |
| value |  |