## MailServerValidating {#mailservervalidating}

This event occurs when validating an email addresss on its mail server.

**Returns:** System::Event<void( System::SharedPtr <System::Object>, System::SharedPtr < Aspose::Email::Tools::Verifications::MailServerValidatingEventArgs >)> Aspose::Email::Tools::Verifications::

```cpp
MailServerValidating()
```