Here are some of them - they do all have a lot in common - but I'm not experience enough with this to completely understand what it's telling me:
2.9 NO_RDNS_DOTCOM_HELO Host HELO'd as a big ISP, but had no rDNS 1.8 FAKE_HELO_AOL Host HELO did not match rDNS: aol.com
These basically say that the server that gave you the message claimed to be AOL, but its IP address did not resolve to a host in the aol.com domain.
Are these coming straight from AOL to your server, or do they pass through some other server or proxy first? You might need to set trusted_networks to take that into account.
Or perhaps are these students using their AOL addresses on non-AOL connections?
Or, finally, you could just have a DNS issue preventing the lookups.
Kelson Vibber
SpeedGate Communications <www.speed.net>
