QMail Admin

For some reason my vqadmin failed to create a new mail domain?? I know I had some /home permissions problems, but that was quite some time ago, perhaps I haven’t added a domain for mail in that time. Anyway, time to refresh my skills and software.

vqadmin

Home Page

cd /src
wget http://www.inter7.com/vqadmin/vqadmin-2.3.2.tar.gz
tar xvfz vqadmin-2.3.2.tar.gz
cd vqadmin-2.3.2
./configure --enable-cgibindir=/home/vqadmin/cgi-bin --enable-htmldir=/home/vqadmin/www
make && make install-strip
vi /opt/httpd/conf/httpd.include
<directory "/home/vqadmin/cgi-bin/vqadmin/">
        deny from all
        Options ExecCGI
        AllowOverride AuthConfig
        Order deny,allow
</directory>
vi /home/vqadmin/cgi-bin/vqadmin/.htaccess
AuthType Basic
AuthUserFile /home/vqadmin/.passwd
AuthName vQadmin
require valid-user
satisfy any
chown nobody /home/vqadmin/cgi-bin/vqadmin/.htaccess
chmod 644 /home/vqadmin/cgi-bin/vqadmin/.htaccess
htpasswd -bc /home/vqadmin/.passwd admin admin_password
chmod 644 /home/vqadmin/.passwd
apachectl stop
apachectl start

All fixed. For a step by step guide to all Qmail software I recommend http://qmailrocks.org

Tagged with: General Linux

Producing Skewness statistics with SQL

Skewness measures the asymmetry of a distribution. A perfectly symmetric distribution has a skewness of zero. A positive skew (right-skewed) means the tail extends to the right — a small number of high values pull the mean above the median.

Exploring the vsql-ai extension

The vsql-ai extension adds AI prompt capabilities and text embeddings directly in SQL queries, with support for Anthropic Claude , Google Gemini , OpenAI ChatGPT , or a local LLM such as Ollama .

Producing Chi-Squared statistics with SQL

The Chi-Squared test is one of the most widely used statistical tests for categorical data. It comes in two flavors: the goodness-of-fit test asks whether an observed frequency distribution matches an expected one, while the test of independence asks whether two categorical variables are associated with each other.