Hello the list,
I have a quite buggy customer network, full of zombie PCs that spends
all days sending spam and wasting the whole "reputation" of my networks.
As a result it sometimes become quite hard to delivers queues for
specific domains such as Yahoo!'s hosted ones. Indeed they have some
temp fail (blacklist) mechanism that forbid my servers to send messages
to them during hours.
Taht's why I would like to setup some ougoing filtering to avoid sending
too much spam through my mail relays. I think SA can help me in doing
so, but I know too it's not really intented to work this way. I guess SA
expects to work on MX hosts more than on smtp relays.
My prerequisites are mainly:
- STOP as much spam as possible at SMTP time (before queuing)
- Have NO (or very few) false positives cause I could not manage
telling thousands of users that they should *always_have_a_subject*,
*shouldn't_write_the_subject_in_CAPS* or anything else.
Further more I can't rely on RBL because a lot of my dyn IP address are
regularily listed on different blacklist.
Does anyone have already setup something like that and what specific
config/tools/plugin could be usefull for me.
If some one already done it.... does he/she have any statistics about
the efficiency of this setup.
Best regards.
