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I am maintaining an IP blacklist. It helps me block more than 90% of attacks. Instead of letting the mail system analyze and deal with them, it blocks them directly at the gateway.
F yeah @winer
I've started doing a two tier RBL. First tier is high chance of spam, increased spam score but not a guaranteed rejection. Second tier is more "you're going to have to whitelist the sender to get mail from this network." The second one is better for networks that host zero ESPs, send almost exclusively spam from their network, but 1-100 customers might have something in that network that sends them email.
The impact of this is probably the best I've done to date to tackle spam.
I have given up on public RBLs because they sometimes block normal mail servers. I rebuilt all of them by myself. They were all used by people who did something bad to my server or network. I found that many of them were attacks on our servers, not just spam. If they were handed over to the mail server, it would cause a lot of pressure on the mail server and affect the efficiency of normal mail.
The best trick I've seen so far, is intentionally timeout connection for 5-10 minutes and then bouncing "Ha-ha-ha, I'm glad I wasted your time"
I really enjoyed reading this thread. It reminds me once again at how you don't even remotely know what kind of a person someone really is without some real perspective that can only be gained over time, and in the context of many interactions, with a clear mind removed from emotional reactions.
Like every human being, I've made the mistake of assuming things about people and their motivations plenty of times in my life, which is human nature of course, but it's something I actively try to be conscious of and avoid.
This thread reminded me of some assumptions I made about @jar when I first read a post of his many years ago somewhere (might have been early in his business, I don't recall when or where I read it). Years later and after reading many more of his posts -- which read like open scripts to his inner dialog sometimes -- and also interacting with him directly and becoming a customer of his, I became aware of how very wrong my initial assumptions about him were.
You can make your own assumptions of @jar however you want, but I've come to firmly believe that @jar is most likely a good human being operating with a moral code based on a value system of taking responsibility for his actions, providing for his family, standing up for his customers, and zealously protecting his business.
He can't stand cheaters and scammers and is like a guard dog protecting his customers because it actually matters to him on several levels... including on a visceral level IMO. He also doesn't seem interested in snooping around in someone's personal drama to purposely cause them harm, but at the same time he also doesn't have much of a filter and doesn't pull any punches when he decides he needs to punch to defend himself and his business.
I don't know him personally, I can't vouch for any of that on a personal level, but you're seeing one angle of that in this thread. Just go back through a handful of threads over time with posts from @jar and you'll see a pattern begin to emerge, and corroborating evidence of the above. Sure, some of his comments may be "jarring" (pun intended) at times, and I'm guessing he feels he's over-stated something or perhaps over-reacted every once in a while like any other human being, but through the blunt statements you'll also see the things I mentioned above.
Now I say all this because the human condition fascinates me, and this thread once again reminds me of how assumptions work, as my own initial assumptions of @jar were very short-sighted and objectively flawed.
And also, I think it's interesting that sometimes our assumptions are so wrong about someone that we can miss out on the good things that they offer!
In this case, what I've learned from more perspective, context, and non-emotional observations, is that those qualities of @jar mentioned above are pretty darn good qualities to have in an email provider.
Now I also still wish he'd consider offering an additional premium encrypted/privacy service, and I'd sign up immediately for that too. But I understand why he doesn't offer that, and so I have to get those encrypted services elsewhere. But for the services he does offer, he makes no illusions about what you are going to get, and he delivers on that. And because of that, I'm still a customer.
If some people just used some common sense and read the terms of service, they'd know he is delivering what he said he would deliver, and moreover, he is going to zealously defend that so the vast majority of his customers can carry on without any drama.
EDIT: minor clarification
This delay method is not very good. I have tried it, and the delay will cause some normal mail servers to think there is an error and will abandon the connection. So I turned off the delay.
What? This is common in the US?
I did some Googling, seems most mobile network operators had it in the 90s, and got rid of it sometime in the late 90s or at least around that time, couldn't find a single network in Sweden still offering this.
Same here in Korea. You can send emails from MMS (although the IP reputation, etc. is shit), but there's no way around other than paying those SMS providers directly.
Yeah mail2sms is virtually unknown in Germany too. I vaguely remember some providers offering this like 20+ years ago. I'd rate chances of anyone still doing so at exactly zero.
Edit: At least in 2018 the ex-staterun monopolist provider still offered that. Thank god i'm not using them. Turns out if someone knows your number and attaches @t-mobile-sms.de they can drain your bank account one email or 0,19€ at a time...
Edit2: They also canceled the service (together with MMS... lol) last year.
Why is it always the dumb ones who out themselves?