TIP: Block Spam from domains on the South Africa ISPA Spam Hall of Shame using DNSBL

April 22, 2012 at 09:30 AM | categories: Postfix, Howto, Exim, Email, Linux, Tips, Security | View Comments
The South Africa Internet service providers association (ISPA) maintains a list of known spammers dubbed the Spam Hall of Shame. The list is contains both domains as well as email addresses, this list is published on a webpage without downloadable...
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TIP: Use a random IP address from an pool of addresses with Exim

April 21, 2012 at 08:21 AM | categories: Tips, Exim, Linux | View Comments
Create a lookup file /etc/exim/ips.txt with 1: xxx.xxx.xxx.1 2: xxx.xxx.xxx.2 3: xxx.xxx.xxx.3 4: xxx.xxx.xxx.4 Set the transport to: remote_smtp: driver = smtp interface = "${lookup {${randint:5}} lsearch {/etc/exim/ips.txt}}" randint will return a random number...
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Links of the day: Running IPv6 at home

April 20, 2012 at 05:44 PM | categories: IPv6, Links, Linux | View Comments
I have been running IPv6 on my internet servers for over 2 years now, so i thought it was time i take to running it at home as well. I run a couple of Linksys WRT34GL routers with TomatoUSB...
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Exim commands you should know

April 15, 2012 at 11:56 AM | categories: Tips, Exim, Linux | View Comments
Print out the exim configuration options exim -bP Print the contents of the queue exim -bp Print the number of items in the queue exim -bpc Test addresses exim -bt addresss Print exim version and test...
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Tip: Extract RPM name without version numbers

April 11, 2012 at 05:56 PM | categories: Tips, Linux | View Comments
for rpm in $(rpm -qa|sort); do rpm=${rpm##*/}; rpm=${rpm%%-[0-9]*}; echo ${rpm}; done You can also use a simpler command just from within rpm rpm -qa --queryformat "%{NAME}\n"|sort ...
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Tip: Push static routes to clients via DHCP

April 09, 2012 at 11:26 AM | categories: DHCP, Tips, Linux | View Comments
While researching a fix for ICMP redirect messages generated when you point a route to a device on the same segment i came across RFC3442, which defines how DHCP servers can push static routes to DHCP clients. Unfortunately i did...
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NFS server on Fedora 16

April 08, 2012 at 08:44 AM | categories: Tips, Fedora, Linux | View Comments
With the advent of systemd on Fedora 16 setup of NFS has changed quite abit, some of the services have been renamed which can cause a bit of frustration for users who are used to the old setup. The...
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Tip: Extracting files from Linux packages .deb and .rpm

March 31, 2012 at 07:55 AM | categories: Tips, Linux | View Comments
dpkg-deb -x {deb-package name} {target directory} rpm2cpio | cpio -id ...
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Mail server setup with Exim, MySQL, Cyrus-Imapd, Horde webmail on Centos 5.1

March 04, 2009 at 12:37 PM | categories: Horde, Centos, Howto, Exim, Cyrus, Linux, Email | View Comments
This how to describes the installation and configuration of a mail system on Centos 5.1 with selinux enabled for enhanced security. This system will be able to service HTTP, HTTPS, SMTP, TLS, SMTP-AUTH, IMAP, POP3 clients and is virtual...
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Setup DHCP Fail over on Centos 5.1

June 16, 2008 at 04:24 PM | categories: Centos, Howto, Sysadmin, DNS, Linux, DHCP | View Comments
This tutorial will walk you through setting up DHCP fail over on CENTO 5.1 using the default ISC dhcp server, this can easily be adapted to any other Linux distro out there. You will most likely need Fail over...
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Creating a Cacert postfix certificate

February 03, 2008 at 06:58 PM | categories: Postfix, SSL, Security, Linux | View Comments
Cacert is a certification authority that provides free certificates, i guess using them is much better that having your own local CA. We need to download the cacert root certificate and install it on the server Download and...
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CENTOS 5 virtual hosting howto

February 03, 2008 at 06:58 PM | categories: Horde, Centos, Howto, Exim, Cyrus, Linux, Email | View Comments
This tutorial shows how to set up a CentOS 5.x server to offer all services needed by virtual web hosters. These include web hosting,smtp server with (SMTP-AUTH and TLS,SPF,DKIM,Domainkeys),DNS,FTP,MySQL,POP3/IMAP,Firewall,Webalizer for stats. I will use the following software: Database...
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