dialin-spammer-block can be used to detect and
block dialin clients that try to send send spam
over your mailserver. A spammer is detected by
watching the mailserver logfile and counting the
mails sent by each dialin client. If a client
exceeds the limit of mails that may be sent during
a certain amount of time, the client will be
blocked to relay further mails on the mailserver
until the RADIUS server reports that the client
has disconnected.
