Philip Hazel Books

Exim: The Mail Transfer Agent

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Exim delivers electronic mail, both local and remote. It has all the virtues of a good postman: it's easy to talk to, reliable, efficient, and eager to accommodate even the most complex special req...

The Exim SMTP Mail Server

By Herbert Voß, Philip Hazel

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E-mail is the most widely used application on the Internet. Exim is rapidly becoming one of the most widely used mail servers, handling mail for tens of millions of users daily.Exim is free softwar...

The Exim Smtp Mail Server: Official Guide For Release 4

By Philip Hazel

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Enabling users to take full advantage of the Exim system, this practical reference provides an essential resource for e-mail administrators, designers, or implementers of network applications. Incl...

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.