Your sendmail is configured to block incoming junk mail, and you have been asked to allow junk mail through when it is addressed to specific recipients.

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Spammers hide their true identities. You want to provide as much information as possible to track down spammers that use your system.

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Run the sendmail -d0.1 command. The "Compiled with:" line output by the command should contain MAP_REGEX. If it does not, recompile sendmail.

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You want to configure sendmail to filter mail addressed to specific domains using procmail as the mail filtering software

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You want to filter mail with procmail before making deliveries to local users

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