Comments on: 8 Tips for Reducing Spam https://www.ourchurch.com/blog/8-tips-for-reducing-spam/ A look at how trends in communication technology impact individuals and organizations. Thu, 26 Jan 2023 18:15:58 +0000 hourly 1 https://wordpress.org/?v=6.7.2 By: William Haller https://www.ourchurch.com/blog/8-tips-for-reducing-spam/#comment-746044 Mon, 20 Jul 2015 21:26:51 +0000 https://www.ourchurch.com/blog/?p=49738#comment-746044 Some example stats from work – One user objected to grey listing. That user’s e-mail has averaged 5868 e-mail messages per month so far this year trapped by spam assassin rules. The other 179 users are averaging 39/month each. The only difference is grey listing.

]]> By: William Haller https://www.ourchurch.com/blog/8-tips-for-reducing-spam/#comment-746005 Sat, 18 Jul 2015 01:02:36 +0000 https://www.ourchurch.com/blog/?p=49738#comment-746005 Use greylisting. Bounce the first e-mail from any unknown client and wait for the server to resend it. After a specific amount of time, allow the message in. Use longer times for countries that spam a lot.

Maintain a white list of people you have e-mailed and skip greylisting for these domains.

It’s incredibly effective because most spam comes from infected computers which get shut down by their ISP before they can repeat or just don’t retry at all.

It doesn’t get rid of everything, but it helps a great deal.

If you then enable RBL blocking on the server, you reduce the spam per user to just a few messages per day. This can be problematic because sometimes the various people who manage the RBLs are a bit too aggressive. But it helps a great deal.

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