May I ask 2 more questions?

With "TrainPristine on" it ought to become impossible to sort the 
filtered mail by checking for some added spam header. But if its 
"TrainPristine off", I wonder, how much of the incoming mails will 
be kept in database?
And if dspam is trained only with $ dspam_train and when dspam
is offered a message from stdin, how will that serial number from
database be found and used to relearn the original message?



ATTACHED:

README says:
   DSPAM uses a signature-based system, where a serial number of
   sorts is appended to each email processed by DSPAM. DSPAM reads this serial
   number when the user forwards (or bounced) a message to what is called their
   "spam email address". The serial number points to temporary information
   stored on the server (for 14 days by default) containing all of the 
   information necessary for DSPAM to relearn the message. This is necessary
   in order to relearn the *exact* message DSPAM originally processed.

     If you are using an IMAP based system, Web-based email, or other form of
     email management where the original messages are stored on the server in
     pristine format, you can turn this signature feature off by setting
     "TrainPristine on" in dspam.conf. DSPAM will then use the message itself
     that you provide it to train, which MUST be identical to the original
     message in order to retrain properly.

dspam.conf says:
   # TrainPristine: for systems where the original message remains server side
   # and can therefore be presented in pristine format for retraining. This 
option
   # will cause DSPAM to cease all writing of signatures and DSPAM headers to 
the
   # message, and deliver the message in as pristine format as possible. This 
mode
   # REQUIRES that the original message in its pristine format (as of delivery)
   # be presented for retraining, as in the case of webmail, imap, or other
   # applications where the message is actually kept server-side during reading,
   # and is preserved. DO NOT use this switch unless the original message can be
   # presented for retraining with the ORIGINAL HEADERS and NO MODIFICATIONS.
   #
   # NOTE: You can't use this setting with dspam_trian; if you're going to use 
it,
   #       wait until after you train any corpora.
   #
   #TrainPristine on

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