One way to do this is to
ensure that all hostnames in headers are fully canonical.
??? One sure way to know whether your site is spamming is to receive and read
email from people who complain about receiving such spam. You should always
read mail addressed to Postmaster. As an added precaution, you should also create
an alias for the address abuse and read that mail too. Complaints will also be
sent to webmaster about HTTP problems, and to hostmaster about DNS problems.
You should accept and read all mail that might indicate a problem needing
attention.
??? If you are running an old version of sendmail and have not yet upgraded, beware
that you might be running a site that will relay email to anywhere in the world.
Called ???promiscuous relaying,??? this could get your site listed with DNSBL sites.
Try to upgrade soon.
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
299
Chapter 8 CHAPTER 8
Test Rule Sets with -bt
The sendmail program offers a mode of operation called rule-testing mode that
allows you to observe the flow of addresses through rule sets. The -bt command-line
switchcauses sendmail to run in rule-testing mode. This mode is interactive. You
enter rule set numbers or names, addresses, and other commands, and sendmail processes
them and prints the results.
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