If yo want to add the default signature and the original message, and include bullet points, it is simpler to use the eMail Word editor.
The following will reply to the selected message, categorize the original message and retain your signature,
Code:
Sub ReplyMSG()
'Graham Mayor - https://www.gmayor.com - Last updated - 15 Jul 2023
Dim olItem As Outlook.MailItem
Dim olReply As MailItem ' Reply
Dim olInsp As Outlook.Inspector
Dim wdDoc As Object
Dim oRng As Object
On Error Resume Next
Select Case Outlook.Application.ActiveWindow.Class
Case olInspector
Set olItem = ActiveInspector.currentItem
Case olExplorer
Set olItem = Application.ActiveExplorer.Selection.Item(1)
End Select
Set olReply = olItem.ReplyAll
With olReply
.BodyFormat = olFormatHTML
Set olInsp = .GetInspector
Set wdDoc = olInsp.WordEditor
Set oRng = wdDoc.Range(0, 0)
oRng.Text = "Am currently working on your quote, I should have it done today or first tomorrow morning. " & _
"Any question, please feel free to email directly."
oRng.collapse 0
oRng.Text = vbCr & vbCr & "Item 1" _
& vbCr & vbCr & "Item 2" _
& vbCr & vbCr & "Item 3"
olReply.Display
olReply.Send
End With
olItem.Categories = "Juan Cabrera”"
olItem.Close olSave
lbl_Exit:
Set olItem = Nothing
Set olReply = Nothing
Set olInsp = Nothing
Set wdDoc = Nothing
Set oRng = Nothing
Exit Sub
End Sub