Short story: I fiddled with gps for a while since it seems like it would perform better than postgrey. I've thrown in the towel for now. gps has the nice feature of whitelisting on sender, but it just seems like it has too much "other" baggage.
postgrey install:
yum install postgrey
chkconfig postgrey on
# add to /etc/sysconfig/postgrey
# OPTIONS="--unix=$SOCKET --delay=120 --auto-whitelist-clients=8 --greylist-text='Service temporarily unavailable. Please rety in %s seconds.' "
# add to /etc/postfix/main.cf:
# smtpd_recipient_restrictions =
# permit_mynetworks
# reject_unauth_destination
# check_policy_service unix:postgrey/socket
service postgrey start
service postfix restart
Long story: OMGWTFBBQ@$%^@#$!!!! You'd think using a nice database abstraction layer like libdbi would make gps a snap. But nooooo RedHat has to be a total pain in my ass. The include libdbi-dbd RPMs for MySQL and PostgreSQL but not for SQLite. And the one thing I don't want to run on my slicehost is an memory-hogging database server, so SQLite is really what I want. So after contemplating it, I just rolled my own spec file and that did it... mostly. gps and it's accompanying perl script gps-maintain.pl have different opinions on what 'dbtype' should be and what the accompanying db_dbtype_dbdir should be, but a post on the forums allowed me to hack it up so it was working. In the end, I spent a lot of time on it and if postgrey sucks the life out of my VM, I might reconsider gps. But for now, I'm tired of installing complex software.
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