Hi All.
1) does anybody use Slackware and spammass-milter ?

2)
I've install spamassassin+ spammass-milter, configure it and start milter.
spamass-milter -f -p /var/run/spamass-milter -B local_user@local.domain -r 7

Most part it working perfectly until I've get SPAM mail.

If I get Spam mail, then sendmail try to send report mail to local user - and put this report to /var/spool/clientmqueue (this is because local mailer is "nail" and it use submit.cf) , so after that sendmail try to to send mail from /var/spool/clientmqueue and find SPAM mail, ...and put this report to /var/spool/clientmqueue .
So I get mail loop.

How I can avoid this loop ?

I'm afraid I never did get spamassassin working as a milter on my system. Instead, I used a procmail script with spamc to check whether a message is spam. That seems to work pretty well for a small mail system.

Depending on the number of users you're looking at, it may be more effective to do it that way.