On 2017-08-14 20:08, Scott wrote: > I would like to turn around and put those individual messages back > into mbox format, again, without changing their original headers.
The first question is: why? sa-learn works on just about any format: individual messages, multiple messages in a flat directory, maildirs. If in spite of the above you _must_ have a mbox file, I would just setup a trivial procmail config (maybe even an empty one, supplemented with one or two environment variables including DEFAULT) and pipe the messages through procmail one by one. You probably need the -f option to force generation of the From_ mbox delimiter. -- Please don't Cc: me privately on mailing lists and Usenet, if you also post the followup to the list or newsgroup. Do obvious transformation on domain to reply privately _only_ on Usenet.
