Milter-greylist

According to Fabien Tassin:
> 
> acl blacklist list "spam trap users" code "451" ecode "4.7.1" msg "Greylisting in action, please come back later" flushaddr
> 
> It now reports blacklist as greylist, hidding the spamtraps but still flushing the bad ips from the db.
> Let see if that helps.

hm, doesn't work.

sm-mta reports "reject=550 5.7.1 Command rejected" while it was "reject=551 5.7.1 Go away!" before.
I assume it's because m-g returned SMFIS_REJECT and not SMFIS_TEMPFAIL. I patched it.
Let see now.

/Fabien