How to send email to multiple recipients in Excel

Sub Mail_ActiveSheet()
'Working in 97-2010
    Dim FileExtStr As String
    Dim FileFormatNum As Long
    Dim Sourcewb As Workbook
    Dim Destwb As Workbook
    Dim TempFilePath As String
    Dim TempFileName As String
    Dim I As Long
    Dim LR As Long

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

    Set Sourcewb = ActiveWorkbook

    'Copy the sheet to a new workbook
    ActiveSheet.Copy
    Set Destwb = ActiveWorkbook

    'Determine the Excel version and file extension/format
    With Destwb
        If Val(Application.Version) < 12 Then
            'You use Excel 97-2003
            FileExtStr = ".xls": FileFormatNum = -4143
        Else
            'You use Excel 2007-2010, we exit the sub when your answer is
            'NO in the security dialog that you only see  when you copy
            'an sheet from a xlsm file with macro's disabled.
            If Sourcewb.Name = .Name Then
                With Application
                    .ScreenUpdating = True
                    .EnableEvents = True
                End With
                MsgBox "Your answer is NO in the security dialog"
                Exit Sub
            Else
                Select Case Sourcewb.FileFormat
                Case 51: FileExtStr = ".xlsx": FileFormatNum = 51
                Case 52:
                    If .HasVBProject Then
                        FileExtStr = ".xlsm": FileFormatNum = 52
                    Else
                        FileExtStr = ".xlsx": FileFormatNum = 51
                    End If
                Case 56: FileExtStr = ".xls": FileFormatNum = 56
                Case Else: FileExtStr = ".xlsb": FileFormatNum = 50
                End Select
            End If
        End If
    End With

    '    'Change all cells in the worksheet to values if you want
    '    With Destwb.Sheets(1).UsedRange
    '        .Cells.Copy
    '        .Cells.PasteSpecial xlPasteValues
    '        .Cells(1).Select
    '    End With
    '    Application.CutCopyMode = False

    'Save the new workbook/Mail it/Delete it
    TempFilePath = Environ$("temp") & "\"
    TempFileName = "Part of " & Sourcewb.Name & " " _
                 & Format(Now, "dd-mmm-yy h-mm-ss")

    With Destwb
        .SaveAs TempFilePath & TempFileName & FileExtStr, _
                FileFormat:=FileFormatNum
        LR = Range("C" & Rows.Count).End(xlUp).Row
        On Error Resume Next
        For I = 1 To LR
            .SendMail Range("C" & I).Value, _
                      "This is the Subject line"
            If Err.Number = 0 Then Exit For
        Next I
        On Error GoTo 0
        .Close SaveChanges:=False
    End With

    'Delete the file you have send
    Kill TempFilePath & TempFileName & FileExtStr

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