Blog

What Is Spam

The definition of spam is an issue of opinion. The US government has essentially defined spam as email that fails to comply with the CanSpam Act. A number of states have enacted their own laws. Each of us is free to use whatever criteria that we feel is appropriate. My notion of what constitutes spam follows: Unsolicited Bulk Email ("UBE") Unsolicited: We didn't subscribe to it. Bulk: Commercial and non-commercial email, apparently destined to multiple ...

Read More

FC3 – Building a Custom Kernel

A Simplified Approach Some preliminaries; I have created an rpm build user "rpmbuild." The reason for creating a specific user is that some people need to create the home directory someplace other than /home where there is more disk space. Compiling a kernel may require close to 1gb of space. In rpmbuild's home directory, I have created the file  .rpmmacros with the following lines. %_build_name_fmt %%{NAME}-%%{VERSION}-%%{RELEASE}.%%{ARCH}.rpm %_topdir %(echo "$HOME")    #Use rpmbuild's home directory rather than /usr/src/redhat Now you ...

Read More

Linux Diversions

Spam Trap Lists for RBLDNSD (updated daily in REAL TIME). Now available via rsync! Fedora 3 : Building a Customized Kernel A very simplistic approach to creating the source code and building a customized kernel from "kernel.src.rpm" Fedora: Creating a Local DNS Blocklist for Use by Postfix with RBLDNSD A basic guide to eliminating spam through the use of local DNS blocklists. This is particularly useful for banning large numbers of hosts in abusive locales. ...

Read More

RBLDNSD Blocklist for Postfix

Thanks to Michael Tokarev and Paul Howarth who helped me muddle my way through this. Spam Trap Lists for RBLDNSD (updated in real time) are available via rsync or wget. Read this "howto" first. OVERVIEW: Postfix provides a powerful arsenal of anti-spam tools. So why go to the trouble of setting up and utilizing a local DNS blocklist? Aside from the fact that doing so is fun and educational, I find it these ...

Read More