Real Time BlackList Checking

One of the things I do in my 'day job' is to monitor the email system. We get a lot of email here at the office.

Our daily 'email load' is about 250K messages/day. Of those, we block about 150K messages using real time blacklists. The other 100K of messages are about 75-80% spam, which is filtered with our email filter program.

You can see that using Realtime Blacklists can really reduce the load on a mail server, blocking a lot of spam.

But there can be 'issues'. If your mail domain name gets on a blacklist, then you'll start having email problems. Sometimes it's random: if your ISP has multiple servers handling the mail, then you might get randomly assigned to a mail server that has problems.

There are ways to check if your domain name (the part after the "@" in your email address) are on a blacklist. One good site I found is here: http://www.robtex.com/rbls.html . Just type in your domain name, and see if you are on any of a number of blacklists.

There's some really technical stuff in their results, and they also have some other great tools to look up information about your domain name.

Recommended.