spamassassin question about emails used for learning

[Richard Bos]

Hi,

how long should one keep the messages, that are used to teach spamassassin, 
what is spam and what is ham.  Sofar I have not been able to find this 
information.  Must the (spam/ham) emails be kept for each spamassassin 
(sa-learn) run, or can they be removed after e.g. 1 sa-learn run?

-- 
Richard Bos
Without a home the journey is endless