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  2. Maildir - Wikipedia

    en.wikipedia.org/wiki/Maildir

    The Maildir e-mail format is a common way of storing email messages on a file system, rather than in a database. Each message is assigned a file with a unique name, and each mail folder is a file system directory containing these files. Maildir was designed by Daniel J. Bernstein circa 1995, with a major goal of eliminating the need for program ...

  3. procmail - Wikipedia

    en.wikipedia.org/wiki/Procmail

    procmail. procmail is an email server software component — specifically, a message delivery agent (MDA). It was one of the earliest mail filter programs. It is typically used in Unix-like mail systems, using the mbox and Maildir storage formats. procmail was first developed in 1990, by Stephen R. van den Berg. [ 1]

  4. Reverse Polish notation - Wikipedia

    en.wikipedia.org/wiki/Reverse_Polish_notation

    Video: Keys pressed for calculating eight times six on a HP-32SII (employing RPN) from 1991. Reverse Polish notation (RPN), also known as reverse Ɓukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow their operands, in contrast to prefix or Polish notation (PN), in which operators precede their operands.

  5. Postfix (software) - Wikipedia

    en.wikipedia.org/wiki/Postfix_(software)

    Website. www.postfix.org. Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail. It is released under the IBM Public License 1.0 which is a free software license. Alternatively, starting with version 3.2.5, it is available under the Eclipse Public License 2.0 at the user's option.

  6. Stack-oriented programming - Wikipedia

    en.wikipedia.org/wiki/Stack-oriented_programming

    Stack-oriented programming is a programming paradigm that relies on a stack (or multiple stacks) to manipulate data and/or pass parameters. Several programming languages fit this description, notably Forth, RPL, and PostScript. Stack-oriented programming languages operate on one or more stacks, each of which may serve a different purpose.

  7. Dovecot (software) - Wikipedia

    en.wikipedia.org/wiki/Dovecot_(software)

    Dovecot is an open-source IMAP and POP3 server for Unix-like operating systems, written primarily with security in mind. [3] Timo Sirainen originated Dovecot and first released it in July 2002. Dovecot developers primarily aim to produce a lightweight, fast and easy-to-set-up open-source email server. The primary purpose of Dovecot is to act as ...

  8. Shunting yard algorithm - Wikipedia

    en.wikipedia.org/wiki/Shunting_yard_algorithm

    In computer science, the shunting yard algorithm is a method for parsing arithmetical or logical expressions, or a combination of both, specified in infix notation. It can produce either a postfix notation string, also known as Reverse Polish notation (RPN), or an abstract syntax tree (AST). [ 1 ] The algorithm was invented by Edsger Dijkstra ...

  9. Email address - Wikipedia

    en.wikipedia.org/wiki/Email_address

    The format of an email address is local-part@domain, where the local-part may be up to 64 octets long and the domain may have a maximum of 255 octets. [5] The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321) and the associated errata.