Easy enough with a macro provided they are all being forwarded to the same recipient(s).
Code:
Sub ForwardSelectedMessages()
'Graham Mayor - https://www.gmayor.com - Last updated - 01 Dec 2019
'Forwards the currently selected messages
Const strTo As String = "someone@somewhere.com" 'recipient
Const strBody As String = "Please see message below." 'Covering message
Const strCC As String = "" 'CC recipients(s) if required
Dim sPath As String
Dim olItem As MailItem
Dim olFwd As MailItem
Dim olInsp As Inspector
Dim wdDoc As Object
Dim oRng As Object
For Each olItem In Application.ActiveExplorer.Selection
If olItem.Class = OlObjectClass.olMail Then
Set olFwd = olItem.Forward
With olFwd
.To = strTo
.CC = strCC
.Display
.BodyFormat = olFormatHTML
Set olInsp = .GetInspector
Set wdDoc = olInsp.WordEditor
Set oRng = wdDoc.Range(0, 0)
oRng.Text = strBody
'.Send 'remove apostrophe after testing
End With
End If
Next olItem
lbl_Exit:
Set olItem = Nothing
Set olFwd = Nothing
Set olInsp = Nothing
Set wdDoc = Nothing
Set oRng = Nothing
Exit Sub
End Sub