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Troubleshooting Open Source Spam Filtering on GWIA



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January 2, 2007 4:15 am

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Problem

Using an Opensource spam filter / virus scanner, we could not implement the “Unknown users rejection” feature. Also, messages with authorized recipients would be bounced.

Solution

GWIA was making black-list lookups, which slowed down the acceptance of vaild messages. The mail scanner would then treat all addresses as unauthorized. Turning off black-list lookups on gwia fixed the issue.

Example

Place the following directive in the /etc/sysconfig/postfix file to enable the function:

POSTFIX_ADD_SMTPD_RECIPIENT_RESTRICTIONS=?reject_unverified_recipient?is placed 

Environment

  • Groupwise 7.01 runing on OES Linux.

  • The mailscanner is maia mailguard, built on SLES 10, with amavisd, postfix, and spamassassin.
  • The filter is built using the excellent instructions provided by Stephen Carter of U.K.
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Disclaimer: This content is not supported by Novell. It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test it thoroughly before using it in a production environment.

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