I just looked up the netasq thing. They say they are using RBL
blacklists; they don't say which ones they use. The free ones you can
use with SA as well (or you are already using them...); there are
commercial RBLs that you have to pay for. Netasq says for this feature
you need a support contract. Find out what they are using and spend the
money for some commercial RBLs and perhaps somebody who configures your
mailserver and amavis to fight spam effectively.
Or to turn it another way round : I find it a bad idea to put eMail
communication into the responsibility of a black box I do not really
understand. Somebody in the company should have an idea what is going on
inside. None of these boxes work by magic; only maintenance and
knowledge of a firewall of antivirus/antispam system makes a secure
gateway.
Just my 5cts.
Jakob Curdes
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