SmtpClient.EnableSsl Property in asp.net

I have purchased a hosting with domain registration now i want to use my company mail account to send an email like [email protected] , below is my code

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Private Sub SendEmail()

'These twos are commented on Morning on 2/5/2014

GetUserIDEmail(Session("LoggedInUserId"))

' GetEmailAddressOfReporintUser(Hdm.Value)

' Using mailMessage As New MailMessage()

Dim Mail As New MailMessage

Try

Mail.IsBodyHtml = True

Dim MailText As String = Nothing

Mail.Subject = " Report Submitted By : " & Session("LoggedInUserFullName") & " " & "User Type:" & GetUserTypeName(CInt(Session("UserTypes")))

MailText = MailText + "" & "Dear User, " & "

Mail.IsBodyHtml = True

Mail.Body = MailText

Dim files As List(Of HttpPostedFile) = DirectCast(Cache(Me.Key), List(Of HttpPostedFile))

For Each file As HttpPostedFile In files

Mail.Attachments.Add(New Attachment(file.InputStream, Path.GetFileName(file.FileName), file.ContentType))

Mail.From = New MailAddress("[email protected]")

Dim smtp As New SmtpClient("venus.hostingmadeeasy.com")

smtp.EnableSsl = true

smtp.Credentials = New System.Net.NetworkCredential("[email protected]", "pakistan")

smtp.Port = 25

Catch ex As Exception

ex.Message.ToString()

End Try

End Sub

My code run ok when i made smtp.Enab,eSsl=false but when i select it to true it gives an error as mentioned below
server does not support secure connections. smtp exception