Ouch - €5 per domain, or at today's USD exchange rate is $6.56 per domain per month!!
For us, we'd be in the 5,000 domain block would cost €750/month (or $983/month).
Not likely that I'll be signing up on this. I know that we had discussed using ASSP also, but due to the amount of servers that we're running, the cost would have been outrageous.
Not likely that I'll be signing up. I did see a few people talk about this on the cPanel forums with some pretty good reviews - but again, the biggest concern from everyone is the fees being charged. For those prices, I can run everything through Barracuda and spend $2500 on their filter machines, or just $80/month leased.
I've been using SpamAssassin from many years and found it very helpful.
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We have been using MailFoundry for the past 5 years or so. Has been working pretty well (much much better than spamassassin). It's a lower cost, and arguably better alternative to something like Barracuda.
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Yeah I use a Barracuda anti-spam/virus appliance to block all spam. For other email I use Gmail/Google Apps, their spam filter is good and its nice because you can access the spam folder easy from the web interface or IMAP folder.