Hi Antonimo,

You would need to use something like the following to split the merged
document into separate documents:

Sub splitter()

' splitter Macro

' Macro created by Doug Robbins to save each letter created by a mailmerge
as a separate file.

Dim Letters As Integer, Counter As Integer
Letters = ActiveDocument.Sections.Count
Selection.HomeKey Unit:=wdStory
Counter = 1
While Counter < Letters
   DocName = "Myletter" & LTrim$(Str$(Counter))
   ActiveDocument.Sections.First.Range.Cut
   Documents.Add
   Selection.Paste
   ActiveDocument.Sections(2).PageSetup.SectionStart = wdSectionContinuous
   ActiveDocument.SaveAs FileName:=DocName, FileFormat:= _
       wdFormatDocument, LockComments:=False, Password:="",
AddToRecentFiles:= _
       True, WritePassword:="", ReadOnlyRecommended:=False,
EmbedTrueTypeFonts:= _
       False, SaveNativePictureFormat:=False, SaveFormsData:=False, _
       SaveAsAOCELetter:=False
   ActiveWindow.Close
   Counter = Counter + 1
Wend

End Sub

using an ActiveDocument.Protect statement applying the desired form of
protection before the ActiveDocument.SaveAs statement.

Then you could use the procedure in the article "Mail Merge to E-mail with
Attachments" at

http://www.mvps.org/word/FAQs/MailMerge/MergeWithAttachments.htm

To do the email bit.

Please post any further questions or followup to the newsgroups for the
benefit of others who may be interested.  Unsolicited questions forwarded
directly to me will only be answered on a paid consulting basis.

Hope this helps
Doug Robbins - Word MVP