Dear all .Netters

My company mail server using Lotus Notes.
I want to send e-mail between us.

Dim message As New MailMessage("melky@int.mzhcb.com", "kusno@int.mzhcb.com", "test", "test")
Dim emailClient As New SmtpClient("mzhcb.com")
emailClient.Send(message)

But i only get this message error :
The remote name could not be resolved: 'mzhcb.com'

is the host in SmtpClient same as mail server ?