Stop macro looking at personal book when not told to

[cooket4]

Hi

I have a macro that emails individual tabs to the address states in each tabs' A1 cell

Sub Email_All()
    Dim sh As Worksheet
    Dim wb As Workbook
    Dim FileExtStr As String
    Dim FileFormatNum As Long
    Dim TempFilePath As String
    Dim TempFileName As String
    Dim OutApp As Object
    Dim OutMail As Object



    TempFilePath = Environ$("temp") & "\"

    If Val(Application.Version) < 12 Then
        FileExtStr = ".xls": FileFormatNum = -4143
    Else
          FileExtStr = ".xlsm": FileFormatNum = 52
    End If

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

    Set OutApp = CreateObject("Outlook.Application")

    For Each sh In ThisWorkbook.Worksheets
        If sh.Range("A1").Value Like "?*@?*.?*" Then

            sh.Copy
            Set wb = ActiveWorkbook

            TempFileName = "Sheet " & sh.Name & " of " _
                         & ThisWorkbook.Name & " " _
                         & Format(Now, "dd-mmm-yy h-mm-ss")

            Set OutMail = OutApp.CreateItem(0)
            With wb
                .SaveAs TempFilePath & TempFileName & FileExtStr, _
                        FileFormat:=FileFormatNum
                On Error Resume Next
                With OutMail
                    .To = sh.Range("A1").Value
                    .CC = ""
                    .BCC = ""
                    .Subject = UF_Email.Txt_Subject.Text
                    .htmlBody = UF_Email.Txt_Intro & "<br><br>" & UF_Email.TxtText & "<br><br>" & UF_Email.Txt_Name.Text & "<br><br>" & UF_Email.Txt_Title & "<br><br>" & UF_Email.Txt_Tel
                                       
                    .Attachments.Add wb.FullName
                End With
                On Error GoTo 0
                .Close SaveChanges:=False
            End With
            Set OutMail = Nothing

            Kill TempFilePath & TempFileName & FileExtStr
        End If
    Next sh

    Set OutApp = Nothing

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

The issue I have is that I want to use this macro from my personal workbook. But when I try, the macro looks for the email address in A1 of my personal macro book, rather than the workbook I want to send out. The code doesnt say 'look at my personal macro book', but as it is constantly creating new temp files im not sure where to start. How can I stop the macro looking at my personal book?

Thank You