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Re: real time content filtering - is there hope?

On Thu, May 25, 2006 at 09:30:48AM -0500, Rodney Richison wrote:
> Is there any hope at all for real-time spam/virus filtering using
> postfix or exim? Everything I find says low volume sites only.. 

Where "low volume" is still quite a generous number of emails/day on
modern hardware..

> Just wondering.  It would be nice...

How many emails are you expecting?  You can do what you want with
exim, making callouts to spamd and clamav for example, you'll just
need a little bit more hardware than you would if you were accepting
the mail and then scanning it later.

There's no such thing as a free lunch and content filtering is the
most expensive part of accepting an email.  If you want to do it
during the SMTP conversation then this is going to slow down the
rate at which you can accept and deal with mails, but it's probably
still worth it.


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