Use IMAP client

[lesnikowski]

Try using Mail.dll .NET mail component, for downloading messages.

Mail.dll includes POP3, IMAP and SMTP clients and powerful MIME parser.

   Dim imap As New Imap
   imap.Connect("imap.server.com")

   imap.User = "user"
   imap.Password = "password"
   imap.Login()

   imap.SelectInbox()
   Dim uidList As List(Of Long) = imap.SearchFlag(Flag.Unseen)

   For Each uid As Long In uidList
       Dim mail As ISimpleMailMessage = New SimpleMailMessageBuilder() _
           .CreateFromEml(imap.GetMessageByUID(uid))
       Console.WriteLine(mail.Subject)
   Next

   imap.Close(True)

You can download it at Mail.dll - mail component for .NET