> Does anyone use the Barracuda's for outbound spam filtering and is it as
> good as the inbound version? I need to keep my mail server from getting
> blacklisted and am looking for a way to do it. Apparently someone is using
> my server to relay spam, (I am using pop before smtp so they must be
> authenticating first.) Also is it possible to use the outbound if you have
> outsourced email services, aka "Jumpline" ???
Are you using Exim or what for an MTA? With exim you can setup
rate-limit to end stuff like this. I have exim setup to only allow a
given IP to send too 200 recipients in a 2 hour period. Being
spammers need to send many thousand of messages to get any pay back it
makes your server of little use to them. There is also a plugin for
Squirrelmail to limit how many messages per day each user can send
there.
I also have this in Mikrotik firewall.
/ip firewall filter
add action=add-src-to-address-list address-list=spammer
address-list-timeout=6h chain=smtp comment="" connection-limit=15,32
disabled=no dst-port=25 \
protocol=tcp tcp-flags=syn
add action=tarpit chain=smtp comment="" disabled=no dst-port=25
protocol=tcp src-address-list=spammer
Matt
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