Add Chart in email body - excel

Question

Hi I am using below code to add chart and send email to multiple recipients. It works fine. In my sent item i can see a perfect email created and sent. But all the recipients are not able to see the charts. All they see is two red X
Sub Send_Email_Updated()
Dim olApp As Object
Dim NewMail As Object
Dim NewMail1 As Object
Dim ChartName As String
Dim ChartName1 As String
Dim SendingRng As Range
Dim htmlString As String
Dim OMail As Outlook.MailItem
Set wb = ActiveWorkbook
Set S1 = wb.Worksheets("Incident Tickets")
Set S2 = wb.Worksheets("Assets and Representatives")
Set S3 = wb.Worksheets("Email")
'Set SendingRng = Worksheets("Email").Table("A30:C43")
Set SendingRng = Worksheets("Email").Range("A30:C43")
Set olApp = CreateObject("Outlook.Application")
Set OMail = olApp.CreateItem(olMailItem)
' Group 1
If S3.Cells(7, 2) <> 0 Or S3.Cells(8, 2) <> 0 Or S3.Cells(9, 2) <> 0 Then
OMail.Display
'fill in the file path/name of the gif file app graph
ChartName = Environ$("Temp") & "\Chart 1.gif"
ActiveWorkbook.Worksheets("Email").ChartObjects("Chart 1").Chart.Export _
Filename:=ChartName, FilterName:="GIF"
'fill in the file path/name of the gif file trend graph
ChartName1 = Environ$("Temp") & "\Chart 31.gif"
ActiveWorkbook.Worksheets("Email").ChartObjects("Chart 31").Chart.Export _
Filename:=ChartName1, FilterName:="GIF"
Set NewMail = olApp.CreateItem(0)
With NewMail
.Subject = "Action Required on Incidents and Problem Candidates for GC060.1 - Group 1"
.To = "animesh.das#xyz.com"
.HTMLBody =
"<img src=" & "'" & ChartName1 & "'>" & "<br/>" & "<br/>" & "_
"<img src=" & "'" & ChartName & "'>" & "<br/>" & "<br/>" & _
.Send
End With
ChartName = vbNullString
ChartName1 = vbNullString
End If
End Sub