Thanks for your replies. However, I don't normally want to have edit_headers set, and the situation is sufficiently rare that I'll go without this for the time being. If I really needed this often, I guess the way to go would be to put in a macro that sets edit_headers and then calls an alternative editor that automatically inserts my external text file with the list of attachments. In fact, I think that should work pretty well. Thanks again, m.