Re: RBL for e-mail addresses POSTFIX

On 14.10.2020 09:51, Johann Beretta wrote:
> On 9/26/20 3:55 PM, KIKI wrote:
> 
>> Let's don't talk about politics. BL lists work and I don't care who runs
>> them and for what reason. We should be happy they exist. The same
>> situation is with ad blockers. I don't care who is behind. They simply work.
> 
> Reveling in your ignorance isn't noble, it's sad.  You would not last
> long in the I.T. world.

I am not I.T. world - I am "self MTA" and please let me decide the way
of fighting with spam.

> Decent lists require multiple confirmations before the IP address is
> blacklisted.  Blocking email is serious. You don't want to fuck up and
> block legit senders.

It depends of the way the list works. For me it is enough when I get one
unsolicited email. Listing in RBL is only an information that someone
got a spam like this. Nothing more.

> Decent lists also expire entries when no spam is detected coming from
> those IP addresses for some predetermined amount of time.

You can use such lists as you feel are good for you. This is not
obligatory.

> IP addresses sometimes change hands... You don't want to blacklist
> blocks forever.. You just want to block them while they are sending
> spam.  Nothing worse than getting a new IP block from your ISP and
> finding out every goddamn one of them is on a blacklist.

Before you get a new IP you should check the reputation of the ISP. For
example we have very big problems with Aruba s.p.a. Poland is spammed by
Polish citizens from abroad from hundred thousands of IPs, snowshoe,
every time from a random, different IP classes so all Aruba's IP ranges
and AS are listed. MTA administrator like me can decide which lists are
suitable for him. There is no obligation of using them, but the truth is
that all penis enlargement and other fake shit are gone. Immediate silence.
I don't have senders from Aruba so I don't care. When I find a problem
with one or two domains I will whitelist them, period. The rest can
bounce away.