Work the E-mail, Part I
Postfix can store strings and filtering expressions in many indexed or linear maps. These structures are used to store information on how to deal with clients, senders and single messages. Indexed maps are binary databases built from regular text files. External relational databases also can be used as indexed maps. Linear maps are regular text files read from top to bottom until a matching record is found, so the order of the record matters.
This article is an introduction to the topic of this series, rather than a practical tutorial in order to clarify some general concepts. But, don't worry; we'll get to the practical concerns in the next article. In the meantime, take a quick look the documentation listed in the Resources and keep it handy for when you read “Work the Mail, Part II”. You also are welcome to write me directly about any specific e-mail tip you would like to find in this series.
Marco Fioretti is a hardware systems engineer interested in free software both as an EDA platform and, as the current leader of the RULE Project, as an efficient desktop. Marco lives with his family in Rome, Italy.
Articles about Digital Rights and more at http://stop.zona-m.net CV, talks and bio at http://mfioretti.com
Free DevOps eBooks, Videos, and more!
Regardless of where you are in your DevOps process, Linux Journal can help!
We offer here the DEFINITIVE DevOps for Dummies, a mobile Application Development Primer, and advice & help from the expert sources like:
- Linux Journal
- Users, Permissions and Multitenant Sites
- New Products
- Flexible Access Control with Squid Proxy
- Security in Three Ds: Detect, Decide and Deny
- High-Availability Storage with HA-LVM
- Tighten Up SSH
- DevOps: Everything You Need to Know
- Solving ODEs on Linux
- Non-Linux FOSS: MenuMeters
- Nmap—Not Just for Evil!