3 ms·

I run my own email server and get nearly zero spam due to the simple reverse DNS check which catch most of them, rspamd catches the rest. I have about 50 000 em

by kuon 2y ago

I run my own email server and get nearly zero spam due to the simple reverse DNS check which catch most of them, rspamd catches the rest. I have about 50 000 emails in daily with about 500 delivered and in those 500 about 20 which are spam. Also, to remove the problem of false positive, refuse spam at the SMTP connection level and do not use a spam folder. This way users will get an MTA email in case of false positive.

sph 2y ago
> get nearly zero spam due to the simple reverse DNS check which catch most of them On my Fastmail account, 99% of spam comes from a gmail address. I imagine there's a lot more that are filtered upstream with a similar DNS check, but my point is I receive most spam from legitimate addresses on the world's largest email service.
- saghm 2y ago
  I feel like 5-10 years ago most of the spam I got was from Yahoo accounts, and sometime in the past few years that's switched over to being mostly Gmail. I used to think that Google was doing something to make it harder for spammers to mass register accounts, but if that's was ever the case, it doesn't seem to be anymore.
- mjl- 2y ago
  As more mail servers use domain reputation to classify (accept/reject) incoming deliveries (helped with dmarc-like policies), messages from gmail.com will get a harder time getting delivered to mail servers they also try to deliver spam to. This provides natural pressure for gmail to reduce their outgoing spam rate. I'm sure they do try to get outgoing spam down. Spammers are just a resourceful bunch... Any large free email provider will have these problems. It's a reason to use your own domain for email, with your own reputation, instead of sharing your reputation with the whole world, including spammers.
- kuon 2y ago
  That's weird, I get zero spam from gmail and my domain is from 2000 so my email addresses are everywhere with catchall on the domain. I am not doubting you, but did you check that the email was actually coming from google servers?
johnklos 2y ago
This is exactly what I do, and for exactly the same reasons. I don't do any kind of content based filtering in part because some of my users do anti-spam, anti-phishing work, so of course they need to be able to talk about spam and phishing, and they need to forward along spam / phishing, without worrying about filters. Also, every email, accepted or not, has specific reasons for what happens to them, not a vague set of rules that nobody knows like Gmail has.

by kuon 2y ago

sph 2y ago

> get nearly zero spam due to the simple reverse DNS check which catch most of them On my Fastmail account, 99% of spam comes from a gmail address. I imagine there's a lot more that are filtered upstream with a similar DNS check, but my point is I receive most spam from legitimate addresses on the world's largest email service.

saghm 2y ago
I feel like 5-10 years ago most of the spam I got was from Yahoo accounts, and sometime in the past few years that's switched over to being mostly Gmail. I used to think that Google was doing something to make it harder for spammers to mass register accounts, but if that's was ever the case, it doesn't seem to be anymore.
mjl- 2y ago
As more mail servers use domain reputation to classify (accept/reject) incoming deliveries (helped with dmarc-like policies), messages from gmail.com will get a harder time getting delivered to mail servers they also try to deliver spam to. This provides natural pressure for gmail to reduce their outgoing spam rate. I'm sure they do try to get outgoing spam down. Spammers are just a resourceful bunch... Any large free email provider will have these problems. It's a reason to use your own domain for email, with your own reputation, instead of sharing your reputation with the whole world, including spammers.
kuon 2y ago
That's weird, I get zero spam from gmail and my domain is from 2000 so my email addresses are everywhere with catchall on the domain. I am not doubting you, but did you check that the email was actually coming from google servers?

johnklos 2y ago

This is exactly what I do, and for exactly the same reasons. I don't do any kind of content based filtering in part because some of my users do anti-spam, anti-phishing work, so of course they need to be able to talk about spam and phishing, and they need to forward along spam / phishing, without worrying about filters. Also, every email, accepted or not, has specific reasons for what happens to them, not a vague set of rules that nobody knows like Gmail has.