4 ms·

Spammers use vpn nowadays. This make these spammhaus like services useless. They change IPs every week. Most mail protection models against spam don't work. I

by chmike 4y ago

Spammers use vpn nowadays. This make these spammhaus like services useless. They change IPs every week. Most mail protection models against spam don't work. I have an idea of a method that could help reduce spam and undesirable mails. It would be free for non-spammers and spammers would pay. The problem is that I'm not sure if people would be ready to adopt it. There is also many different ways to execute, and I'm not sure which one to pick.

johnklos 4y ago
People don't set up email servers on VPN endpoints. That's not how email works.
- chmike 4y ago
  You don't need a mail server to send mail. One can send mails through a VPN as client.
  - johnklos 4y ago
    Then the spam is coming from the email servers which are used to relay that spam. Headers can be forged, so the source before the spam server can't be trusted as real.
sylware 4y ago
spammhaus is blocking self-hosted smtp servers. Have a look at grey listing.
- chmike 4y ago
  Spamhaus is blocking by IP which can be an smtp server or a client. The SMTP protocol does not allow to distinguish a sending SMTP server from a client. By using a VPN, you "randomize" the IP address and thus make spamhaus and equivalent services useless. I created my own IP blacklist and tracked it. The only method I found to filter my spammers is to reject mails from hosts without a name. This eliminated 80% of spam, but it won't last long. The mail system is completely broken.
  - sylware 4y ago
    use grey listing
    - chmike 4y ago
      I have spammers retrying 20 times before giving up. This protection is well known and easily circumvented be spammers.
      - sylware 4y ago
        but it filters a lot already because many do retry 20 times in less than 20 minutes.
- inferiorhuman 4y ago
  With Sonic I have to use their servers for outbound stuff since they block outbound SMTP without a static IP (and they don't offer static IPs with fiber). It's a price I'm willing to pay since I typically don't see false positives (and ye I check my logs periodically) with Spamhaus. Unfortunately I've moved to Proton and the increase in spam is pretty damn frustrating.

by chmike 4y ago

johnklos 4y ago

People don't set up email servers on VPN endpoints. That's not how email works.

chmike 4y ago
You don't need a mail server to send mail. One can send mails through a VPN as client.
- johnklos 4y ago
  Then the spam is coming from the email servers which are used to relay that spam. Headers can be forged, so the source before the spam server can't be trusted as real.

sylware 4y ago

spammhaus is blocking self-hosted smtp servers. Have a look at grey listing.

chmike 4y ago
Spamhaus is blocking by IP which can be an smtp server or a client. The SMTP protocol does not allow to distinguish a sending SMTP server from a client. By using a VPN, you "randomize" the IP address and thus make spamhaus and equivalent services useless. I created my own IP blacklist and tracked it. The only method I found to filter my spammers is to reject mails from hosts without a name. This eliminated 80% of spam, but it won't last long. The mail system is completely broken.
- sylware 4y ago
  use grey listing
  - chmike 4y ago
    I have spammers retrying 20 times before giving up. This protection is well known and easily circumvented be spammers.
    - sylware 4y ago
      but it filters a lot already because many do retry 20 times in less than 20 minutes.
inferiorhuman 4y ago
With Sonic I have to use their servers for outbound stuff since they block outbound SMTP without a static IP (and they don't offer static IPs with fiber). It's a price I'm willing to pay since I typically don't see false positives (and ye I check my logs periodically) with Spamhaus. Unfortunately I've moved to Proton and the increase in spam is pretty damn frustrating.