Hello,
I currently have few users who are targeted with subscription bombs.
Initially they received over 1000 subscription request/confirmations at fist day.
From then, mailboxes receive over 100 various emails from various legitimate websites/servers every day with subscribed content.
Has anyone experience with protecting against it ?
Problem is, that most of emails are legitimate, and they pass spam filters easily. A good part of email comes from amazon servers or Mailchimp for example, so blocking it by IP is not reasonable, as good mail flow will also be effected.
Also, some emails are coming from bad quality websites, which has one-click subscribe feature, and email doesn't even include unsubscribe headers or url in email itself. That makes collecting a bunch of emails and feeding them to unsubscribe services also not effective.
My last idea is to block all senders with senders email addresses.
Is there an easy way to create Object list with mass records instead of putting it one by one ?
Also, bouncing-rejecting those emails would be useful, as blocking them (accepting and then dropping) without any response would assume we do love that spam and want to receive it further ...
Some paid antispam services do have qualifiers for email flow, so it can mark most of that email as marketing/newsletter email. But not sure if Proxmox has any of that capability.
I currently have few users who are targeted with subscription bombs.
Initially they received over 1000 subscription request/confirmations at fist day.
From then, mailboxes receive over 100 various emails from various legitimate websites/servers every day with subscribed content.
Has anyone experience with protecting against it ?
Problem is, that most of emails are legitimate, and they pass spam filters easily. A good part of email comes from amazon servers or Mailchimp for example, so blocking it by IP is not reasonable, as good mail flow will also be effected.
Also, some emails are coming from bad quality websites, which has one-click subscribe feature, and email doesn't even include unsubscribe headers or url in email itself. That makes collecting a bunch of emails and feeding them to unsubscribe services also not effective.
My last idea is to block all senders with senders email addresses.
Is there an easy way to create Object list with mass records instead of putting it one by one ?
Also, bouncing-rejecting those emails would be useful, as blocking them (accepting and then dropping) without any response would assume we do love that spam and want to receive it further ...
Some paid antispam services do have qualifiers for email flow, so it can mark most of that email as marketing/newsletter email. But not sure if Proxmox has any of that capability.