Hi is it possible to make spamassassin write the score of the good e-mails in the header. I can see that it writes the score to the ones considered as spam.
But I just want to know what score some of the spam is getting that is making it through the filter.
Yes, it does it by default.
X-Spam-Status is added to every message, spam or not, unless you reconfigure SA, or are using some other tool which does it's own header insertion (ie: amavis, mailscanner).
