Books about mail processing technology
  • [KyleDDent04] Kyle D Dent. Postfix: The Definitive Guide. O’Reilly & Associates, 2004. ISBN 978-0596002121

  • [Schwartz04] Alan Schwartz. SpamAssassin. O’Reilly & Associates, 2004. ISBN 978-0596007072

Books about related technology
  • [Hertzog13] Raphaël Hertzog & Roland Mas. The Debian Administrator's Handbook: Debian Jessie from Discovery to Mastery, Freexian, 2013. ISBN 979-1091414050

  • [Bir96] Kenneth P. Birman. Building Secure and Reliable Network Applications. Manning Publications Co, 1996. ISBN 978-1884777295

  • [Walsh10] Norman Walsh. DocBook 5: The Definitive Guide. O’Reilly & Associates, 2010. ISBN 978-0596805029

  • [Richardson07] Leonard Richardson & Sam Ruby. RESTful Web Services. O’Reilly Media, 2007. ISBN 978-0596529260

  • [Friedl97] Jeffrey E. F. Friedl. Mastering Regular Expressions. O’Reilly & Associates, 2006. ISBN 978-0596528126

  • [Mauerer08] Wolfgang Mauerer. Professional Linux Kernel Architecture. John Wiley & Sons, 2008. ISBN 978-0470343432

  • [Loshin03] Pete Loshin, IPv6: Theory, Protocol, and Practice, 2nd Edition. Morgan Kaufmann, 2003. ISBN 978-1558608108

  • [Loeliger12] Jon Loeliger & Matthew McCullough. Version Control with Git: Powerful tools and techniques for collaborative software development. O’Reilly and Associates, 2012. ISBN 978-1449316389

  • [Ahmed16] Wasim Ahmed. Mastering Proxmox - Second Edition. Packt Publishing, 2016. ISBN 978-1785888243

Books about related topics
  • [Bessen09] James Bessen & Michael J. Meurer, Patent Failure: How Judges, Bureaucrats, and Lawyers Put Innovators at Risk. Princeton Univ Press, 2009. ISBN 978-0691143217