LuKreme wrote:
After reading (and implementing)
http://www.postfix.org/STRESS_README.html#hangup I was wondering if
there is any reason not to extend this behavior to 127.0.0.4-8 (the XBL)?
Also, why would I want:
8 rbl_reply_maps = ${stress?hash:/etc/postfix/rbl_reply_maps}
Is there a reason I would only want to hangup on the RBL listed
connections when the server is stressed instead of all the time?
The STRESS_README was written before postfix supported 521 as
a hangup action, so yes, it's reasonable to disconnect after
any RBL hit during stress.
I am somewhat hesitant to recommend using 521 as your
"standard" RBL reject code since the RFCs don't specifically
mention 521/disconnect as a valid code (421/disconnect is
mentioned as a special case). On the other hand, clients
"MUST" interpret any 5xx code as a permanent reject. This
hasn't been widely tested and there's just enough wiggle room
here that it's possible some clients will behave badly. But
it's probably fine.
-- Noel Jones
