Greylisting in kolab to reduce spam

Hi All,

Quick question hopefully someone knows this... ?

I know in postfix you can implement postgrey which I have
find to help reduce 
spam quite a bit in the past.

I believe you can intergreat postgrey in kolab but I'm not
sure if there is a 
point.

Is the 
"smtpd_recipient_restrictions = check_policy_service
unix:private/kolabpolicy"
and
"kolabpolicy_time_limit = 3600
kolabpolicy_max_idle = 20"
a similar thing to  postgrey?
If it is how does this work so that I can try increase it to
reduce spam?

If not then I'll maybe go ahead and try intergreat postgrey
into kolab.

Thanks very much.
-- 
Divan Santana

Skype:          	DivanSantana
Gtalk/MSN:		Divan.SantanaGMail.com

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Hi all,
working on the same subject and try to find that out.
Hopefully someone can help us.

Greetz


> -----Original Message-----
> From: kolab-users-bounceskolab.org 
> [mailto:kolab-users-bounceskolab.org] On Behalf Of
Divan Santana
> Sent: Thursday, December 28, 2006 9:08 AM
> To: kolab-userskolab.org
> Subject: Greylisting in kolab to reduce spam
> 
> Hi All,
> 
> Quick question hopefully someone knows this... ?
> 
> I know in postfix you can implement postgrey which I
have 
> find to help reduce spam quite a bit in the past.
> 
> I believe you can intergreat postgrey in kolab but I'm
not 
> sure if there is a point.
> 
> Is the
> "smtpd_recipient_restrictions =
check_policy_service 
> unix:private/kolabpolicy"
> and
> "kolabpolicy_time_limit = 3600
> kolabpolicy_max_idle = 20"
> a similar thing to  postgrey?
> If it is how does this work so that I can try increase
it to 
> reduce spam?
> 
> If not then I'll maybe go ahead and try intergreat
postgrey 
> into kolab.
> 
> Thanks very much.
> --
> Divan Santana
> 
> Skype:          	DivanSantana
> Gtalk/MSN:		Divan.SantanaGMail.com
> 
> _______________________________________________
> Kolab-users mailing list
> Kolab-userskolab.org
> https:
//kolab.org/mailman/listinfo/kolab-users
> 

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On Thursday 28 December 2006 01:08, Divan Santana wrote:
> Hi All,
>
> Quick question hopefully someone knows this... ?
>
> I know in postfix you can implement postgrey which I
have find to help
> reduce spam quite a bit in the past.
>
> I believe you can intergreat postgrey in kolab but I'm
not sure if there is
> a point.
>
> Is the
> "smtpd_recipient_restrictions =
check_policy_service
> unix:private/kolabpolicy" and
> "kolabpolicy_time_limit = 3600
> kolabpolicy_max_idle = 20"
> a similar thing to  postgrey?
> If it is how does this work so that I can try increase
it to reduce spam?
>

No it is not the same ... 

If you check the /kolab/etc/postfix/master.cf you will see
what that policy 
service is.  It points to :
/kolab/etc/kolab/kolab_smtpdpolicy

From that file the comments state the services :

# 1) Only authenticated users can use From addresses
<username>$domain
# 2) Some distribution lists are only available to
authenticated users

> If not then I'll maybe go ahead and try intergreat
postgrey into kolab.
>


postgrey is very simple to integrate ... I have done it on
several 
installations.

Install and configure postgrey to your liking, and then add
: 

check_policy_service inet:127.0.0.1:60000,

to the smtpd_recipient_restrictions configuration, and make
sure it is before 
the check_policy_service unix:private/kolabpolicy entry.



HTH,


Andy

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On Thursday 28 December 2006 10:55, Andrew J. Kopciuch
wrote:
> No it is not the same ...
>
> If you check the /kolab/etc/postfix/master.cf you will
see what that policy
> service is.  It points to :
/kolab/etc/kolab/kolab_smtpdpolicy
>
> From that file the comments state the services :
>
> # 1) Only authenticated users can use From addresses
<username>$domain
> # 2) Some distribution lists are only available to
authenticated users
>
> > If not then I'll maybe go ahead and try intergreat
postgrey into kolab.
>
> postgrey is very simple to integrate ... I have done it
on several
> installations.
>
> Install and configure postgrey to your liking, and then
add :
>
> check_policy_service inet:127.0.0.1:60000,
>
> to the smtpd_recipient_restrictions configuration, and
make sure it is
> before the check_policy_service
unix:private/kolabpolicy entry.

Awesome! This is great! Thanks Andy 

Will give it a bash 
-- 
Divan Santana

Skype:          	DivanSantana
Gtalk/MSN:		Divan.SantanaGMail.com

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Op donderdag 28 december 2006 09:08, schreef Divan Santana:
> If not then I'll maybe go ahead and try intergreat
postgrey into kolab.

perhaps you can implement some of the other techniques
described on 
http://www.freesoftwaremagazine.com/articles/focu
s_spam_postfix as well?
I believe that quite a few can be implmeneted inkolab too,
if that's not 
already done.

-- 
Richard Bos
Without a home the journey is endless

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>
> Awesome! This is great! Thanks Andy 
>
> Will give it a bash 

If you are lucky enough to be using an ubuntu based distro,
they have a very 
nicely packaged version of postgrey.  Not sure about stock
Debian, but I'm 
sure it's similar.  I can not vouch for other distributions.
 :(

apt-get install postgrey
Customize /etc/default/postgrey (if desired)
Customize /etc/default/whitelist_clients (if desired)
Customize /etc/default/whitelist_recipients (if desired)

change /kolab/etc/kolab/templates/main.cf.template
/kolab/sbin/kolabconf


And that's it.



Andy

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Am Donnerstag, 28. Dezember 2006 schrieb Andrew J.
Kopciuch:
> > Awesome! This is great! Thanks Andy 
> >
> > Will give it a bash 
>
> If you are lucky enough to be using an ubuntu based
distro, they have a
> very nicely packaged version of postgrey.  Not sure
about stock Debian, but
> I'm sure it's similar.  I can not vouch for other
distributions.  :(

I just tried with CentOS 4.5. The postgrey package is
available via dag or 
rpmforge. Just had to create /etc/sysconfig/postgrey to make
it listen on an 
inet socket:
----- snip -----
# Options to postgrey
OPTIONS="$OPTIONS --inet=60000"
----- snap -----
Then change main.cf.template in the same way as described in
the earlier 
mails.

Very easy to setup indeed! 

regards,
Andreas Micklei

-- 
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http://www.ivistar.de

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