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Archives for : SpamAssassin

Antispam for Email Servers

I already published a while ago an article showing how I set up a server and email using the most common tools for OpenSource environment on Linux. Used Postfix, Dovecot, Postfixadmin, RoundCube and Spamassassin.

Now I will show another tool that is an alternative to Spamassassin which is the MailCleaner, New Year.



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Servidor de Email –; Part 1 ; Necessary facilities

I have my own mail server using Postfix, Dovecot, MariaDB, SpamAssassin, ClamAV, Amavisd-new, fail2ban, nginx, postfixadmin and RoundCube under CentOS 7.
Although it has several recipes for how to configure this package, It took me many hours to figure out how to keep the service running correctly, each setting in main.cf and master.cf and in order to achieve in reducing the flood of spam that arrives every minute.
And anti-spam is the focus of this publication. I have suffered and still suffer with the constant attempts to use my services as a zombie or shedding of viruses, fraud and everything else you can.

I lost count of how many times my DNS service stopped by excess of connection attempts to entupiam the memory and forced the s.. cutting processes to conserve resources and the named was chosen for being the weakest link.
So, This article has focus in the proper configuration for private mail services, a few users and few domains. Certainly a lot of what is in this short manual serves to world-class services, but I believe that for these cases the use of tools or dedicated and specialized services should always be taken into consideration.



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Error when starting Amavisd-new

Two days ago I'm trying to install the software for my new server that will host this blog, my personal projects and my e-mail server.
I'm using as a base this HOWTO.

I had a lot of problems in installation and in particular an error when starting Amavisd-new

Problem in Amavis::DKIM code: Can't locate Crypt/OpenSSL/RSA.pm in @INC

Googando I saw different ways to solve and no work. That's when I realized something silly, but that's making perfect sense. The packages mentioned, Perl-Mail-DKIM and perl-Crypt-OpenSSL-RSA., pointed to EL5 while the package Amavis pointed to EL6.
Checked that the DAG of rpmforge was using EL5 and correct for my Centos 6.3 was to use the DAG EL6. To correct this item and update packages, VOI-la. Everything worked beautifully.

Follow the steps to the fix

first import the key for the repository
rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
Then uninstall the current (use yum search rpmforge-release to find out the correct name of the package), Download the RPM file and make the installation.

> yum remove rpmforge-release-0.5.2-2.el5.rf.x86_64
> wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm
> rpm -i rpmforge-release-0.5.2-2.el6.rf.x86_64.rpm

The last step is to synchronize the distribution, that will cause the packages to be replaced by existing in EL5 EL6.
> yum distribution-synchronization

From this point, If there is already done the installation of all packages previously, they should not show this error.

I hope it helped you.

Useful links
http://wiki.centos.org/AdditionalResources/Repositories/RPMForge#head-f0c3ecee3dbb407e4eed79a56ec0ae92d1398e01