Spamcop has a reporting tool and we began reporting a majority of the spam that got through to help get those spammers on their list. It also feels good to report the spam we get -- were fighting back at spam, in a way. We also noticed that some spammers are very tricky. Spamcops list is IP-based. Several of the spams getting through were coming from domains that changed their mail servers IP frequently and kept on sending spam to our users. That led us to blocking some domains manually with rules like:Our next step was to upgrade our firewall to the Symantec Enterprise Firewall Version 7 that supports multiple RBLs. Here are the ones we are currently using:
Slam the Spam, an upcoming PC Magazine story, for more insights.
For more information: Spam RBL Resources
- and about 15 others.
Spamcops online reporting tool helped us realize a lot of the spam getting through was on other black lists, especially lists that had open relay and proxy servers on them.