Possible this can help some user with spamassassin, or give idea
Signature check in body with SA
----------------------------------------
Example, make your own rule in et/mail/spamassassin/ , this is easy.
my.cf example
#---------
body MY_VIP /(mysecret1234)/i
score MY_VIP -20.0
#---------
this will add -20 SPAM POINTS to all your mail signed in body
Then reject after data all spam more than 5 or according your needs. Most mail after 15 is spam (+99.%)
Signature check in body with SA
----------------------------------------
Example, make your own rule in et/mail/spamassassin/ , this is easy.
my.cf example
#---------
body MY_VIP /(mysecret1234)/i
score MY_VIP -20.0
#---------
this will add -20 SPAM POINTS to all your mail signed in body
Then reject after data all spam more than 5 or according your needs. Most mail after 15 is spam (+99.%)