antispam


Postfix spam prevention with simple means

I've published already quite a few tutorials on greylisting, rbls and so on. Here's another tutorial showing how you can reduce your spam with rather simple means.   First of all we need to edit the file /etc/postfix/main.cf and add those lines: smtpd_helo_required     = yes strict_rfc821_envelopes = yes disable_vrfy_command = yes unknown_address_reject_code  = […]


Integrating Postgrey into Postfix (Greylisting Filter)

In this article I'm going to show the simple integration of Postgrey into a postfix installation: Basically the installation of postgrey is done with: apt-get install postgrey   Then you should (but it's not needed) customize a little bit its configuration file /etc/default/postgrey, which contains: POSTGREY_OPTS="–inet=127.0.0.1:60000" #Postgrey uses the port 60000 locally POSTGREY_TEXT="Greylisted" #This parameter is optional […]


Spamdyke as Antispam Solution in Plesk with Qmail

First of all you need to make sure that you have the necessary packages to compile spamdyke: apt-get install gcc make libc-dev   Then download the latest version: http://www.spamdyke.org/download.html   At the moment that I'm writing this howto, the latest version is 4.0.10: wget http://www.spamdyke.org/releases/spamdyke-4.0.10.tgz tar -xvzf spamdyke-4.0.10.tgz cd spamdyke-4.0.10/spamdyke   After unpacking it, you […]


Greylisting with Postfix

Greylisting is an effective method of reducing spam. There's a daemon called GLD which is quite easy to integrate into Postfix. If you do not have your Postfix installation running, checkout for my other howto's.   Installation of the needed package: apt-get install postfix-gld   For the service to really start, you need to modify the file /etc/default/gld and change […]


Realtime Blackhole Lists in Postfix

What are Realtime Blackhole Lists (RBL's)? RBL's are services that are keeping track of IP addresses from which spam or malware has been received. Cross-checking your incoming mails with one or more services may reduce your spam.   Some known example RBL's: sbl-xbl.spamhaus.org bl.spamcop.net More can be found here: spamlinks.net/filter-dnsbl-lists.htm     These RBL's can be […]