Automatic sending email

I am writing the following code but It doesn't include anything in the body and an empty email is being sent.

Sub Mail_Selection_Range_Outlook_Body(a As String)

    Dim rng As Range
    Dim OutApp As Object
    Dim OutMail As Object

    Set rng = Nothing
    On Error Resume Next
   Dim wbkMyBook As Workbook


    Set rng = Workbooks("C:\Documents and Settings\Desktop\A1").Worksheet(a).UsedRange
    
    On Error GoTo 0

    
    With Application
        .EnableEvents = False
        .ScreenUpdating = False
    End With

    Set OutApp = New Outlook.Application
    Set OutMail = OutApp.CreateItem(olMailItem)

    On Error Resume Next
    With OutMail
      
               .Recipients.Add "Smith Morgan"
                
        .Subject = "Reminder"
        .HTMLBody = RangetoHTML(rng)
        .Send
    End With
    On Error GoTo 0

    With Application
        .EnableEvents = True
        .ScreenUpdating = True
    End With

    Set OutMail = Nothing
    Set OutApp = Nothing
End Sub
Function RangetoHTML(rng As Range)
    Dim fso As Object
    Dim ts As Object
    Dim TempFile As String
    Dim TempWB As Workbook
 
    TempFile = Environ$("temp") & "/" & Format(Now, "dd-mm-yy h-mm-ss") & ".htm"
    
    rng.Copy
    Set TempWB = Workbooks.Add(1)
    With TempWB.Sheets(1)
        .Cells(1).PasteSpecial Paste:=8
        .Cells(1).PasteSpecial xlPasteValues, , False, False
        .Cells(1).PasteSpecial xlPasteFormats, , False, False
        .Cells(1).Select
        Application.CutCopyMode = False
        On Error Resume Next
        .DrawingObjects.Visible = True
        .DrawingObjects.Delete
        On Error GoTo 0
    End With
 
    
    With TempWB.PublishObjects.Add( _
         SourceType:=xlSourceRange, _
         Filename:=TempFile, _
         Sheet:=TempWB.Sheets(1).Name, _
         Source:=TempWB.Sheets(1).UsedRange.Address, _
         HtmlType:=xlHtmlStatic)
        .Publish (True)
    End With
 
    
    Set fso = CreateObject("Scripting.FileSystemObject")
    Set ts = fso.GetFile(TempFile).OpenAsTextStream(1, -2)
    RangetoHTML = ts.ReadAll
    ts.Close
    RangetoHTML = Replace(RangetoHTML, "align=center x:publishsource=", _
                          "align=left x:publishsource=")
 
    
    TempWB.Close SaveChanges:=False
 
    
    Kill TempFile
 
    Set ts = Nothing
    Set fso = Nothing
    Set TempWB = Nothing
End Function