[SAC] Greylisting added to Postfix

[sbarnes]

SAC,

Greylisting has been added to postfix to try and reduce the amount of  
spam that we are seeing.

Postgrey was installed and configured on www.osgeo.org the details on  
how this was done are here,
http://trac.osgeo.org/osgeo/ticket/190  and
http://wiki.osgeo.org/wiki/Postgrey

If postgrey is not the right solution, it's easy to revert back to the  
original config by,

Editing /etc/postfix/main.cf and comment out lines 222 - 236
     smtpd_recipient_restrictions = permit_mynetworks,
                 permit_sasl_authenticated,
                 reject_invalid_hostname,
                 reject_non_fqdn_hostname,
                 reject_non_fqdn_sender,
                 reject_unauth_destination,
                 reject_unknown_recipient_domain,
                 reject_unauth_pipelining,
                 reject_unauth_destination,
                 #reject_rbl_client list.dsbl.org,
                 #reject_rbl_client sbl.spamhaus.org,
                 #reject_rbl_client zen.spamhaus.org,
                 #reject_rbl_client lists.spam.sux.com,
                 check_policy_service unix:postgrey/socket,
                 permit

Restart Postfix
   $ sudo /sbin/service postfix restart

cheers,
shawn