Good ${greeting_time}, Eric!

12 Sep 2015 18:04:08, you wrote to Kees van Eeten:

 AV>>> No: blacklisting the IP networks is the only effective way to fight
 AV>>> spam.
 KV>> I agree with all your methods. At a later stage I added Greylisting,
 KV>> that seems quite effective when the messages originate directly from
 KV>> a spambot. These bots, have no memory for temporary rejects, a real
 KV>> mail server will try again later, with the same message.
 ER> While that used to be true. most spambots these days have their own
 ER> queues

Never seen that.

 ER> or defer themselves to send through another mail server that does
 ER> have a retry queue.

Yes, that's the most common scenario.

 ER> Greylist filtering, thus, has become something that is no longer a
 ER> useful thing more so than other methods.

At least 5 years ago.

 ER> My system, in overall, utilizes postfix with postscreen, various
 ER> reliable RBLs,

DNSBLs - as MAPS RBL was a private name, and DNSBL is common.

 ER> dspamd with dovecot using the antispam plugin to train spam/ham
 ER> messages. With the few spam that still gets through, continued
 ER> manual training has almost completely eliminated my spam issues,

[sarcasm]
My congratulations: using the content-based filtering you are confirming that
your addresses are alive and can be spammed.
[/sarcasm]

 ER> far more so than Google's Gmail has been able to do.

Gmail is for idiots who don't care neither of their own privacy (well, that's
their choice), nor of the privacy of other people they are sending messages to
and receiving from (which is next to a crime).


--
Alexey V. Vissarionov aka Gremlin from Kremlin
gremlin.ru!gremlin; +vii-cmiii-cmlxxvii-mmxlviii

... :wq!
--- /bin/vi