PROBLEM:
When I try to mark an email as spam using the link at the bottom of the email, i receive an error:
NOT AUTHORIZED!
You must be on a trusted network to teach Antispam Engine!
RESOLUTION:
This behaviour is by design since version 2.6 to avoid fraudolent bayesian poisoning actions from anuthorized people copying and pasting email strings.
You can disable this restriction under menù System->User Management by changing the option “Users can teach Antispam only from Trusted Net” to NO.
Otherwise if you only need a trusted subnet/host you can leave this option to YES and add the trusted network from menù System-Relay-Trusted Hosts.