Questions[sa-exim](server)

I have a lot of emails in /var/spool/sa-exim/SApermreject. Can I remove these emails or will this lead to some kind of nasty spam problem? Or is this just a history of all the emails that were never received by anyone?

I'd like to redirect all spams (that weren't rejected outright) to mailbox of local user spam (i.e. deliver mail to spam user rather than to original local recipient).

I'm using sa-exim (exim 4 + spamassasin 3.2) on Debian (it's got its own exim4.conf.template convoluted config).

I've tried adding the following router (before exim's real_local):

 spams:
  debug_print = "R: spams $local_part@$domain"
  driver = redirect
  condition = ${if def:h_X-Spam-Flag {1}{0}}
  allow_fail
  allow_defer
  check_local_user
  domains = +local_domains
  data = spam@localhost

but it doesn't seem to be triggered at all.