DNSRBL blackholes
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lwoolard
DNSRBL blackholes
We have Scalix installed on a RedHat box. I'm trying to get the DNSRBL blacklists (sbl-xbl.spamhaus.org & etc.) working for SPAM control. We have them in sendmail.cf as we have on other mail systems using sendmail, but they do not seem to be doing anything. How do I get these very useful lists working with Scalix?
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chris
- Scalix Star
- Posts: 321
- Joined: Mon May 09, 2005 2:56 pm
- Location: Freiburg, Germany
Hi, there has been a bit of discussion about this if you search the boards.
The underlying issue is that Scalix's integrated smtpd listens on your external address :25 to accept and deliver ingress mail from the net and sendmail listens on localhost:25 to accept and delieve egress mail coming from scalix to the net.
So sendmail never gets a socket on those connections and can't drop them.
If you want to blackhole directly, put a sendmail or a postfix relay in front of your scalix system which cann drop the incoming connections.
Alternatively, it is very easy to integrate blacklists into spamassassin - some are in fact integrated and activated by default. These blacklists will then be used to sort out spam, however, it will already have been recieved and is at that point being processed. See http://wiki.apache.org/spamassassin/DnsBlocklists for more information.
Cheers,
Chris
The underlying issue is that Scalix's integrated smtpd listens on your external address :25 to accept and deliver ingress mail from the net and sendmail listens on localhost:25 to accept and delieve egress mail coming from scalix to the net.
So sendmail never gets a socket on those connections and can't drop them.
If you want to blackhole directly, put a sendmail or a postfix relay in front of your scalix system which cann drop the incoming connections.
Alternatively, it is very easy to integrate blacklists into spamassassin - some are in fact integrated and activated by default. These blacklists will then be used to sort out spam, however, it will already have been recieved and is at that point being processed. See http://wiki.apache.org/spamassassin/DnsBlocklists for more information.
Cheers,
Chris
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lwoolard
DNSRBL blackholes
Thanks for the info. After considering the options we have decided to put in a sendmail relay in front of the scalix system. Where in the scalix configuration do we make the changes to have it use the relay?
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chris
- Scalix Star
- Posts: 321
- Joined: Mon May 09, 2005 2:56 pm
- Location: Freiburg, Germany
Hi Larry,
take a look at this doc for more info: http://www.scalix.com/wiki/index.php?ti ... ntegration
What you will essentially want to do is define your relay as a smarthost on the Scalix side, and define your Scalix server local relay for your company's domain on the external sendmail relay.
Chris
take a look at this doc for more info: http://www.scalix.com/wiki/index.php?ti ... ntegration
What you will essentially want to do is define your relay as a smarthost on the Scalix side, and define your Scalix server local relay for your company's domain on the external sendmail relay.
Chris
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William
- Posts: 314
- Joined: Fri Jun 02, 2006 8:28 am
- Location: British Isles
I may have encountered the same problem as you, in that DNSBL lists were not working when pluged into sendmail, here is the thread about how it was solved that maybe relevant to you.
http://www.scalix.com/community/viewtopic.php?t=3788
Also here is a thread about how I made whitelists from scalix contacts and sendmail logs:
http://www.scalix.com/community/viewtopic.php?t=3115
http://www.scalix.com/community/viewtopic.php?t=3788
Also here is a thread about how I made whitelists from scalix contacts and sendmail logs:
http://www.scalix.com/community/viewtopic.php?t=3115
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