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Troubleshooting Open Source Spam Filtering on GWIA
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.
Disclaimer: As with everything else at Cool Solutions, this content is definitely not supported by Novell (so don't even think of calling Support if you try something and it blows up).
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, test, test before you do anything drastic with it.
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