So over the last few months I've been reviewing and updating various aspects of the server software installed locally. An important part of that server software revolves around email. The primary email MTA used at the-eleven.com is the venerable sendmail. At this point there are other MTAs like Postfix, but for my uses I've seen no need to move away from sendmail.

I've been using the sbl-xbl.spamhaus.org DNS Blackhole List to deny incoming mail from well-known Spam IPs and eXploit IPs. This blocks a substantial portion of the spam that I'd receive, as ...