At work, we are configuring sendmail to feed TrendMicro’s Virus Wall which will scan the mail and then hand off to a second sendmail to feed the mail to exchange. We’ve been using Osirusoft‘s DNSbl to block spam and wanted to continue to use it, but also wanted to test how it compares with the spam filtering that Trend sells as an eManager plugin.

I had to learn more about sendmail as a result in order to configure it to add a header (“X-RBL-Warning”) whenever sendmail would have blocked the mail.

For future reference, and to possibly help others, here’s how to add the X-RBL-Warning header to email with sendmail 8.12 .

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