21 Sep
2017
21 Sep
'17
1:57 a.m.
What is needed is an SMTP "Brita" filter!
crud+legit email => smtp filter => legit email
This then goes to your usual MTA. Steve, this may be
the killer app for plan9!
On Wed, 20 Sep 2017 23:54:34 +0100 "Steve Simon" <steve(a)quintile.net>
wrote:
"Steve Simon" writes:
My spam filtering is all plan9 based but the ideals
are all portable.
Greylisting and delaying a few secs before starting the SMTP
conversation are my most successful filters, After this comes
SPF and using spamhaus to validate the senders IP.
I reject some silly domains like localhost.com and usernames like
user and test.
I also have a list of regexps which match the reverse dns
addresses of adsl blocks which catch many spam bots.
The regexps sound like a lot of work but I have some scripts to
analyse my logs and suggest patterns, so its just a click or two
I can block somthing like:
dhcp.[0-9]+.[0-9]+.[0-9]+.[0-9]+.adsl.nasty-isp.net
-Steve