[horde] anti-spam solution for Horde ?

[Niels Dettenbach]

On Monday 15 February 2010 17:41:16 Spyros Tsiolis wrote:
> Does anyone have any idea what anti-spam solution should I use
> for Horde ?
> 
> Do I understand correctly when I say that I've read somewhere Horde
> takes care of it ? Is it true ? Is it fiction ?

from my experience i can say that "anti-spam" solutions within the email 
client are not very effective nor useful. The most effective spam fight is 
possible on the receiving SMTP (MX) - at smtp time - which typically has the 
most informations and options to check the sender.

There are a few very good anti-spam solutions in case you are able to fiddle 
with your SMTP / MDA/LDA configurations. A "good" solutions should consists 
of:
	- a good security configuration for your SMTP (i.e. relaying, sender 
checks)
	- usage of DNSBL / RBLs
	- usage of content / header based solutions like spamassassin / spamd

If you (or your users) are some of that which prefers to have a "spam" folder 
where highly "spam-rated" emails are placed you may mark your emails with a 
spam core (i.e. by spamassassin) and use a (i.e. sieve) filter for all users 
to filter out high ranked mails into a subfolder like "spam".

But many users see no help within such a solution, because they have to watch 
two folders instead of one to make shure to get all important emails.

There is no general howto for successfully fighting spam without any false 
positives - if the results from DNS blocking lists and spamassassin are not 
enough from your viewpoint you have to dig deeper into SMTP and to develope 
your own set or chain of solutions.


hth
cheers,


Niels.  

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  Niels Dettenbach
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