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:
- 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.