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Mail transfer agent
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
Postfix_(software)
Topics referred to by the same term
Postfix may refer to: Postfix (linguistics), an affix which is placed after the stem of a word Postfix notation, a way of writing algebraic and other expressions
Postfix
Mathematics notation where operators follow operands
(RPN), also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow
Reverse_Polish_notation
Mathematics notation with operators preceding operands
normal Polish notation and reverse Polish notation (prefix notation and postfix notation, the two alternatives to infix notation). When Polish notation
Polish_notation
Class of algorithms
the figure: position blue). Post-order traversal can be useful to get postfix expression of a binary expression tree. Recursively traverse the current
Tree_traversal
Grammatical construction in the English language
)". American Speech. 68 (2): 213–218. doi:10.2307/455678. JSTOR 455678. Postfix Not! in English "1992 Words of the Year". American Dialect Society. January
..._Not!
To allow the server to send external emails, an MTA such as Sendmail, Postfix, or Exim is required. Mail is read either through direct access (shell
Comparison_of_mail_servers
Identifier of the destination where email messages are delivered
addresses". Life with qmail. Retrieved 27 January 2012. "Postfix Configuration Parameters". postfix.org. "Exim Configuration Parameters, "local_part_suffix""
Email_address
Programming paradigm that relies on a stack machine model
operate in postfix or Reverse Polish notation: arguments or parameters for a command are listed before that command. For example, postfix notation would
Stack-oriented_programming
precedence rules but binding levels alone do not indicate the timing of the postfix ++ (the ( . )++ operator acts only after y[i] is evaluated in the expression)
Operators_in_C_and_C++
Morpheme placed at the end of a word
singular, masculine). выда-ющ-ий-ся—here suffix -ся (reflexive) is so-called postfix as it is placed after the adjectival ending. wárraidya "emu" — where the
Suffix
Mathematics notation with operators between operands
more difficult to parse by computers than prefix notation (e.g. + 2 2) or postfix notation (e.g. 2 2 +). However many programming languages use it due to
Infix_notation
to the widely used open source mail transfer agents (MTA) Sendmail and Postfix. It allows administrators to add mail filters for filtering spam or viruses
Milter
Rewriting an email message sender address
libsrs2 home page Paper on SRS (PDF) Historical SRS draft by Meng Weng Wong (2003) qmail SRS patch PostSRSd home page (daemon that handles SRS for Postfix)
Sender_Rewriting_Scheme
Internet security protocol
FairEmail for Android allows verifying DANE for SMTP and POP/IMAP servers Postfix PowerMTA Exim Prosody Posteo Tutanota mailbox OpenSSL GnuTLS The TLSA RR
DNS-based Authentication of Named Entities
DNS-based_Authentication_of_Named_Entities
File holding settings for a computer program
(XML) 1.0 (Fifth Edition)". https://opensource.apple.com/source/postfix/postfix-174.2/Postfix.Config/main.cf.default. Archived 2017-08-03 at the Wayback Machine
Configuration_file
Directory management software
application-specific LDAP objects such as Posix and Samba groups and accounts, Postfix objects and a number of Active Directory objects. It also provides an XML-based
LDAP_Admin
SMTP daemon
qmail-smtpd, the SMTP component of qmail, and it is now also compatible with Postfix, Exim, sendmail and virtually any software that "speaks SMTP". It has a
Qpsmtpd
Basic programming language construct
delimiters such as parentheses. In general, an operator may be prefix, infix, postfix, matchfix, circumfix or bifix, and the syntax of an expression involving
Operator (computer programming)
Operator_(computer_programming)
Ways in which keystrokes are interpreted
based on a mixture of infix and postfix notation: binary operations are done as infix, but unary operations are postfix. Because operators are applied
Calculator_input_methods
Dutch noble rank
not a courtesy title and neither does it indicate a lawyer (for whom the postfix ", avocat" or the prefix "Maître" would be used instead, depending on context)
Jonkheer
Model that describes the programmable interface of a computer processor
operand specifiers. The instruction set carries out most ALU actions with postfix (reverse Polish notation) operations that work only on the expression stack
Instruction_set_architecture
Free and open-source productivity software suite
in OpenDesk Name Functionality Univention Nubus Identity and access management (IAM) ClamAV Antivirus Dovecot IMAP server Postfix Mail transfer agent
OpenDesk
Text editor and source code editor for Windows
multiple open files in one window. The program's name comes from the C postfix increment operator. Notepad++ is released as free and open-source software
Notepad++
Simple email-validation system designed to detect email spoofing
Exchange, or have patches or plug-ins available that support SPF, including Postfix, Sendmail, Exim, qmail, and Qpsmtpd. As of 2017, more than eight million
Sender_Policy_Framework
American computer scientist (born 1951)
(born 1951) is a Dutch programmer and physicist best known for writing the Postfix email system. He also wrote TCP Wrapper and collaborated with Dan Farmer
Wietse_Venema
Algorithm to parse a syntax with infix notation to postfix notation
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
Shunting_yard_algorithm
Chemical compound
name is derived from the Greek νάρκη (nárkē), meaning numbness, and the postfix -ine referring to an alkaloid. Noscapine, a related alkaloid "Narceine"
Narceine
Name list
kindness. The word Narm means soft in Persian, and "in" is a descriptive postfix. As Nermin, it is also given as a male name in Bosnia and Herzegovina.
Nermin
Operating system
open-source versions of Elastix, Asterisk, FreePBX, HylaFAX, Openfire and Postfix and provides PBX, fax, instant messaging and e-mail server functionality
Issabel
Server software for macOS
services are provided such as NTP, SNMP, web server (Apache), mail server (Postfix and Cyrus), LDAP (OpenLDAP), AFP, and print server. The inclusion of Samba
Mac_OS_X_Server
Mathematical operation with only one operand
unary operation on A. Common notations are prefix notation (e.g. ¬, −), postfix notation (e.g. factorial n!), functional notation (e.g. sin x or sin(x))
Unary_operation
Shell command and system call that changes the apparent root directory
Atoms is a Linux chroot management tool with a user-friendly GUI. The Postfix mail transfer agent may operate as a pipeline of individually chrooted
Chroot
their banner, or other identifying features. As of December 2023[update], Postfix and exim appeared to be the overwhelming leaders in mail server types,
List_of_mail_server_software
Type of resource record in the Domain Name System (DNS)
until a delivery attempt succeeds. Some servers (such as Sendmail and Postfix 2.1 or later), will attempt the next-furthest MX server after some types
MX_record
Communications endpoint for exchanging data between processes
communication)". 30 April 2018. Retrieved 22 February 2019. "Archive of the "Postfix Discussions" mailing list". 30 September 2000. Archived from the original
Unix_domain_socket
Mail transfer agent server software
Courier-IMAP is a particularly popular combination with Qmail, Exim, and Postfix servers that are configured to use maildirs. Courier's source compiles
Courier_Mail_Server
Open-source email content filter
EAI, IDN) A common mail filtering installation with Amavis consists of a Postfix as an MTA, SpamAssassin as a spam classifier, and ClamAV as an anti-virus
Amavis
Internet protocol used for relaying e-mails
checksum (help) "Postfix SMTPUTF8 support is enabled by default" Archived August 7, 2020, at the Wayback Machine, February 8, 2015, postfix.org "Message Systems
Simple_Mail_Transfer_Protocol
Forwarding email address
(help)CS1 maint: unrecognized language (link) "aliases(5) — Postfix local alias database format". Postfix documentation. Retrieved 2026-03-22. Simple Mail Transfer
Email_alias
position, an operator may be prefix, postfix, or infix. A prefix operator immediately precedes its operand, as in −x. A postfix operator immediately succeeds
Common_operator_notation
German defence manufacturing company
for the civilian market VP70, VP9, VP40 ZF Zielfernrohr Telescopic Sight Postfix Weapon variants not necessarily intended for sharpshooting that come with
Heckler_&_Koch
2018-06-25. Retrieved 2018-07-14. "Email encryption in transit". "Postfix TLS Support". Postfix.org. Retrieved 2014-04-16. Dukhovni; Hardaker (2015-10-14).
Email_encryption
Procedural programming language
inventing the increment and decrement operators (++ and --). Their prefix or postfix position determines whether the value is taken before or after alteration
B_(programming_language)
Number Registry". www.iana.org. IANA. Retrieved 2025-07-30. "Postfix manual – smtp(8)". www.postfix.org. lmtp_tcp_port. Retrieved 2025-07-30. Postel, Jonathan
List of TCP and UDP port numbers
List_of_TCP_and_UDP_port_numbers
U.S. SEC filing used by foreign private issuers
of securities of foreign private issuers pursuant to section 12(g) The postfix /A stands for 'Amendment' The report must be filed within four months after
Form_20-F
Standard sizes of paper
× 229 4+1⁄2 × 9 2∶1 Common edge of C6 and C5 is 161 mm; also known as "Postfix", "DL+" or "DL Max", but those terms are not standardized Italian 110 × 230
Paper_size
Operation on mathematical functions
Mathematicians who use postfix notation may write "fg", meaning first apply f and then apply g, in keeping with the order the symbols occur in postfix notation, thus
Function_composition
Parser generator written in C++
zero or more times. This represents the Kleene star; C++ lacks an unary postfix operator *. x | y Match x. If x does not match, try to match y. +x Match
Spirit_Parser_Framework
Journaling file system
heavily on file-based locks (such as mail transfer agents like qmail and Postfix) if the machine halts before it has synchronized the disk. There are no
ReiserFS
(Urdu: ـ گوٹھ ) means 'village' in Sindhi language. Goth is a prefix or postfix in village names in Rajasthan and Haryana in India, and Sindh in Pakistan
Goth_(village)
Intrusion prevention software framework
with popular filters, including Apache, Lighttpd, sshd, vsftpd, qmail, Postfix and Courier Mail Server. Filters are defined by Python regexes, which may
Fail2ban
away from per connection processes with network access. Postfix The implementation of Postfix was focused on implementing comprehensive privilege separation
Privilege_separation
supported (Web : CLF/ECLF/NECLF on Unix, IIS/W3C on Microsoft; Mail : Postfix/Sendmail/Exim), as well as split/compressed files. "Page tagging" and counter
W3Perl
Software library providing an embedded transactional key-value database
systems. OpenLDAP for which LMDB was originally developed via back-mdb. Postfix via the lmdb_table adapter. PowerDNS, a DNS server. CFEngine uses LMDB
Lightning Memory-Mapped Database
Lightning_Memory-Mapped_Database
Unary operators that add or subtract one from their operand, respectively
the ++ and -- operators, which increment or decrement; their prefix or postfix position determines whether the alteration occurs before or after noting
Increment and decrement operators
Increment_and_decrement_operators
Collaborative software suite
for directory services, and Microsoft Active Directory (AD). Zimbra uses Postfix for its MTA functionality. It includes technology from ClamAV, SpamAssassin
Zimbra
Sanskrit honorific
is common in the names of ragas (musical motifs), either as a prefix or postfix. Some examples are Shree, Bhagyashree, Dhanashree, Jayashree, Subhashree
Shri
Linux distribution
protocols on top of standard open source components (such as Dovecot, Postfix, Samba, etc.) in order to provide native compatibility with Microsoft Outlook
Zentyal
Academic degree found chiefly in German-speaking countries
sometimes the postfix "(Univ.)" is added. If the Diplom has been obtained at a University of Applied Sciences (Fachhochschule) the postfix "(FH)" has to
Diplom
Request for information
Polish czy. Other languages use verbal morphology, such as the -n verbal postfix in the Tunica language. Of the languages examined in the World Atlas of
Question
Email that contains non-ASCII characters in the header
for Internationalized Domain Names (IDN) in email addresses. 2014-07-15: Postfix mailer started supporting Internationalized Email, also known as EAI or
International_email
Utility program in the Postfix Mail software package
Smtp-sink is a utility program in the Postfix Mail software package that implements a "black hole" function. It listens on the named host (or address)
Mail-sink
Authentication networking protocol
an '@' sign, resembling an email address domain name. This is known as postfix notation for the realm. Another common usage is prefix notation, which
RADIUS
Argentine identification number
National Identity Document (DNI) number with a two-digit prefix and a postfix digit as a verification digit. First, the two digits of the prefix are
Código Único de Identificación Laboral
Código_Único_de_Identificación_Laboral
Email server software component
the user's wishes. Message transfer agents (MTAs), such as Sendmail or Postfix), can be configured to use procmail to deliver all mail. A mail retrieval
Procmail
Set of rules defining correctly structured programs
unary conversion of string to number - unary negation (reverses the sign) ++ increment (can be prefix or postfix) -- decrement (can be prefix or postfix)
JavaScript_syntax
Type of computer
frame-base register. The instruction set carries out most ALU actions with postfix (reverse Polish notation) operations that work only on the expression stack
Stack_machine
It has support for many other free software: MySQL, Apache, PHP, qmail, Postfix, Courier, Dovecot, ProFTPd, Webalizer, mod-log-sql, and more. It also connects
Domain_Technologie_Control
Star in the constellation Draco, orbited by eight planets
whole star and planet system is designated by just "Kepler-90", without a postfix, with Kepler-90A specifically referring only to the star, if needed for
Kepler-90
Base-8 numeral representation
prefixed with @, whereas a small (or capital) letter o or q is added as a postfix following the Intel convention. In Concurrent DOS, Multiuser DOS and REAL/32
Octal
Releases of Debian GNU/Linux, a computer operating system
service OpenLDAP, the security software OpenSSH and the mail transfer agent Postfix. Debian was ported to the PowerPC and ARM architectures. Point releases:
Debian release version history
Debian_release_version_history
General-purpose programming language
non-nullable data types. All nullable objects must be declared with a "?" postfix after the type name. Operations on nullable objects need special care from
Kotlin
International computer science competition
automata, bit string flicking, graph theory, assembly programming and prefix/postfix/infix notation. There are five divisions in ACSL: Elementary, Classroom
American Computer Science League
American_Computer_Science_League
Linux distribution
open source projects including Asterisk, FreePBX, HylaFAX, Openfire and Postfix. Those packages offer the PBX, fax, instant messaging and email functions
Elastix
17th-century canals in the Netherlands; UNESCO World Heritage Site
parts of the city and of the urban area are polders, recognizable by their postfix -meer meaning 'lake', such as Aalsmeer, Bijlmermeer, Haarlemmermeer, and
Canals_of_Amsterdam
colours to this source but defined red colour as “Pantone 186 C” (note the C postfix) while the blue was identical to the source (“Pantone 287”). However, in
Flag_of_Norway
Handheld calculator operating system
a UserRPL program as SysRPL code. RPL control blocks are not strictly postfix. Although there are some notable exceptions, the control block structures
RPL_(programming_language)
Utian language of North America
type) OR (allomorph of a root) Word = (theme) + (final suffix) + (optional postfix) Below is a list of frequently occurring morphophonemic rules which Broadbent
Southern_Sierra_Miwok
Object of a mathematical operation, quantity on which an operation is performed
most common, however other notations also exist, such as the prefix and postfix notations. These alternate notations are most common within computer science
Operand
Device used for calculations
engineering calculators, uses reverse Polish notation (RPN), also called postfix notation. A calculation like "8 plus 5" is, using RPN, performed by pressing
Calculator
Computer programming language
&SomeId is the short form for &( SomeId ). &SomeId.postfix is the short form of &( SomeId + "postfix" ). Programming in an OOP style is a broader issue
Harbour (programming language)
Harbour_(programming_language)
Programmable calculator produced by Texas Instruments
system called "Algebraic Operating System" (AOS), where, compared to the postfix RPN system used by other scientific calculators (such as HP), the operator
TI-59_/_TI-58
Unit of digital information
However, the IEC 80000-13 symbol "o" for octets can be confused with the postfix "o" to indicate octal numbers in Intel convention. "Philips - Philips Data
Octet_(computing)
Clone of the Apple I
the "Woz" monitor "\" select hexadecimal memory location "E000" with "R" postfix requesting execution from that point to enter the Basic interpreter. From
Replica_1
Algebraic structure with a binary operation
expression would be written ••a•bcd. Another way, familiar to programmers, is postfix notation (reverse Polish notation), in which the same expression would
Magma_(algebra)
policyd-weight is a mail filter for the Postfix mail transfer agent (MTA) written in Perl. It allows postfix to evaluate mail envelope information and
Policyd-weight
Mathematical operation with two operands
as superscript. Binary operations are sometimes written using prefix or postfix notation, both of which dispense with parentheses. They are also called
Binary_operation
British military rifle cartridge
nitrocellulose versions—first introduced in World War I—were designated with a "z" postfix indicated after the type (e.g. Mark VIIz, with a bullet weight of 175 gr
.303_British
Morpheme that is attached to a word stem to form a new word
prefixoid-stem Appears before the stem, but is only partially bound to it Suffix/postfix look-ing stem-suffix Appears after the stem Suffixoid/semi-suffix/pseudo-suffix
Affix
Numerical analysis programming language
C-like increment and decrement operators ++ and -- in both their prefix and postfix forms. Octave also does augmented assignment, e.g. x += 5. Octave supports
GNU_Octave
Mathematical-logic system based on functions
notation disambiguating alpha conversions De Bruijn notation – notation using postfix modification functions Domain theory – Study of certain posets giving denotational
Lambda_calculus
others. OpenGroupware.org Postfix Mail Dir Cyrus No No Export to iCal XMPP, if purchased No No No No If purchased Open-Xchange Postfix IMAP server dependent
List of collaborative software
List_of_collaborative_software
Convention where symbols represent concepts
the operands (arguments), such as "+ a b". Reverse Polish notation or "postfix notation", which places the operator after the operands, such as "a b +"
Notation_system
Abstract data type
stack structure to hold values. Expressions can be represented in prefix, postfix or infix notations and conversion from one form to another may be accomplished
Stack_(abstract_data_type)
Anti-spam technique involving deliberately delaying responding to connections
under the surface, like in a swamp. By 2000, SMTP e-mail servers, such as Postfix, had rate limiting options that were referred to as tarpitting by the community
Tarpit_(networking)
Bantu language spoken in Uganda
of a singular prefix (wa – 'you'), word (sula – 'sleep'), and singular postfix (otya – 'how did') spoken as one with a plural form that subsequently becomes
Soga_language
where a client "C" is sending to server "S": S: 220 smtp.example.com ESMTP Postfix C: HELO relay.example.com S: 250 smtp.example.com, I am glad to meet you
List of SMTP server return codes
List_of_SMTP_server_return_codes
(first seen in Lexicon) File selection box (inspired by Turbo C) Built-in postfix calculator. It uses ncurses for display, mouse and part of the keyboard
LE_(text_editor)
Order of magnitude indicator
the kelvin temperature unit if the context is unclear). This informal postfix is read or spoken as "thousand", "grand", or just "k". The financial and
Metric_prefix
POSTFIX
POSTFIX
POSTFIX
POSTFIX
Boy/Male
Tamil
Worship
Girl/Female
Latin
Earth.
Boy/Male
Arabic, Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Muslim, Telugu
Ocean
Boy/Male
Hindu
Magnet
Girl/Female
Hindu
World, A group of shells
Male
French
Norman French form of Latin Jodocus, JOSCE means "lord."
Girl/Female
Hindu, Indian, Marathi
Milky; Holy River
Girl/Female
Indian
Just
Boy/Male
Hindu
Girl/Female
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Oriya, Punjabi, Sikh, Sindhi, Tamil, Telugu
Glories; Love; Identity; Pride
POSTFIX
POSTFIX
POSTFIX
POSTFIX
POSTFIX
v. t.
To annex; specifically (Gram.), to add or annex, as a letter, syllable, or word, to the end of another or principal word; to suffix.
n.
A letter, syllable, or word, added to the end of another word; a suffix.
pl.
of Postfix
n.
A letter, letters, syllable, or syllables added or appended to the end of a word or a root to modify the meaning; a postfix.
n.
That which is affixed; an appendage; esp. one or more letters or syllables added at the end of a word; a suffix; a postfix.