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Troubleshooting Open Source Spam Filtering on GWIA


January 2, 2007 4:15 am





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


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.


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

POSTFIX_ADD_SMTPD_RECIPIENT_RESTRICTIONS=?reject_unverified_recipient?is placed 


  • 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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