You would have to execute the merge to a new document, then use a macro to
print each "letter" separately to individual .pdf files, the you could send
them out as attachments to another "transmittal" merge document.
For the macro, you could use
Dim i As Long
With ActiveDocument
For i = 1 To .Sections.Count
.PrintOut Range:=wdPrintFromTo, From:="s" & i, To:="s" & i
Next i
End With
You would need to have the .PDF printer set as the default printer and
supply a file name for each file.
The you could use the information in the article "Mail Merge to E-mail with
Attachments" athttp://word.mvps.org/FAQs/MailMerge/MergeWithAttachments.htm
--
Hope this helps.
Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.
Doug Robbins - Word MVP