**A:** Postfix is a free, open‑source mail transfer agent that routes, queues, and delivers email on Unix‑like operating systems. It is designed to be secure, fast, and easy to administer.

Q: Who created Postfix and who maintains it today?

**A:** Postfix was originally created by Dutch computer scientist Wietse Venema. IBM later became the primary developer and maintainer of the project.

Q: Which licenses govern Postfix’s source code?

**A:** The software is released under two licenses: the Eclipse Public License 2.0 and the IBM Public License.

Q: On which operating systems can I run Postfix?

**A:** Postfix runs on BSD, macOS, and any Unix‑like operating system, and it is packaged for most Linux distributions.

Q: Where can I find the latest stable release of Postfix?

**A:** The latest stable release listed in the source data is version 3.2.5, announced on 28 January 2018 and available from the official site and GitHub repository.

Postfix

mail transfer agent

CreativeWork message_transfer_agent Q1121334

Press Enter · cited answer in seconds

Postfix

Summary

Postfix is a message transfer agent^[1]. Postfix draws 303 Wikipedia views per month (message_transfer_agent category, ranking #2 of 8).^[2]

Key Facts

Postfix is the creator of Wietse Venema^[3].
Postfix's instance of is recorded as message transfer agent^[4].
Postfix's instance of is recorded as free software^[5].
Postfix's developer is recorded as IBM^[6].
Postfix's copyright license is recorded as Eclipse Public License 2.0^[7].
Postfix's copyright license is recorded as IBM Public License^[8].
Postfix's programmed in is recorded as Q15777^[9].
Postfix's operating system is recorded as Q3251801^[10].
Postfix's operating system is recorded as BSD^[11].
Postfix's operating system is recorded as macOS^[12].
Postfix's operating system is recorded as Unix-like operating system^[13].
Postfix's software version identifier is recorded as 3.0.2^[14].
Postfix's software version identifier is recorded as 3.0.3^[15].
Postfix's software version identifier is recorded as 3.1.0^[16].
Postfix's software version identifier is recorded as 3.1.1^[17].
Postfix's software version identifier is recorded as 3.1.3^[18].
Postfix's software version identifier is recorded as 3.2.0^[19].
Postfix's software version identifier is recorded as 3.0.0^[20].
Postfix's software version identifier is recorded as 3.2.3^[21].
Postfix's software version identifier is recorded as 3.2.4^[22].
Postfix's software version identifier is recorded as 3.2.5^[23].
Postfix's software version identifier is recorded as 3.3.0^[24].
Postfix's software version identifier is recorded as 3.0.14^[25].
Postfix's software version identifier is recorded as 3.1.10^[26].
Postfix's software version identifier is recorded as 3.2.7^[27].

Body

Authorship and Creation

Postfix is the creator of Wietse Venema^[3].

Why It Matters

Postfix draws 303 Wikipedia views per month (message_transfer_agent category, ranking #2 of 8).^[2] Postfix has Wikipedia articles in 21 language editions, a strong signal of global cultural recognition.^[28] Postfix is known by 3 alternative names across languages and contexts.^[29]

⭐ Popularity Graph

6/100 established

🌐 Wiki Languages

28 / 423 langs top 10%

📈 Wikipedia Views · last 192h

303/mo 435/yr

🔗 Readers Also Explored · clickstream

message transfer agent

Wietse Venema

list of mail server software

Exim

Postfix

Dovecot

Simple Mail Transfer Protocol

Shodan

📊 Google Search Volume

3,600/mo Navigational

Quick Facts

Instance of message transfer agent, free software

Official website www.postfix.org

Properties

Creator Wietse Venema

Developer IBM

Different from POSfix

Mailing list archive url marc.info, marc.info, marc.info, list.sys4.de, list.sys4.de, list.sys4.de

Operating system GNU/Linux, BSD, macOS, Unix-like operating system

Programmed in C (programming language)

Readable file format Maildir

Software version identifier 3.0.2, 3.0.3, 3.1.0, 3.1.1, 3.1.3, 3.2.0, 3.0.0, 3.2.3, 3.2.4, 3.2.5, 3.3.0, 3.0.14, 3.1.10, 3.2.7, 3.3.2, 2.8.2, 2.8.3, 2.8.4, 2.8.5, 2.8.6, 2.8.7, 2.8.8, 2.8.9, 2.8.10, 2.8.11, 2.8.12, 2.8.13, 2.8.14, 2.8.15, 2.8.16, 2.8.17, 2.8.18, 2.8.19, 2.8.20, 2.9.0, 2.9.1, 2.9.2, 2.9.3, 2.9.4, 2.9.5, 2.9.6, 2.9.7, 2.9.8, 2.9.9, 2.9.10, 2.9.11, 2.9.12, 2.9.13, 2.9.14, 2.9.15, 2.10.0, 2.10.1, 2.10.2, 2.10.3, 2.10.4, 2.10.5, 2.10.6, 2.10.7, 2.10.8, 2.10.9, 2.10.10, 2.11.0, 2.11.1, 2.11.2, 2.11.3, 2.11.4, 2.11.5, 2.11.6, 2.11.7, 2.11.8, 2.11.9, 2.11.10, 2.11.11, 3.0.1, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 3.0.10, 3.0.11, 3.0.12, 3.0.13, 3.0.15, 3.1.0, 3.1.2, 3.1.4, 3.1.5, 3.1.6, 3.1.7, 3.1.8, 3.1.9, 3.1.11, 3.2.1, 3.2.2, 3.2.6, 3.2.8, 3.3.1, 3.3.3, 3.4.0, 3.4.1, 3.4.2, 3.4.3, 3.4.4, 3.1.12, 3.2.9, 3.3.4, 3.4.5, 3.1.13, 3.2.10, 3.3.5, 3.4.6, 3.1.14, 3.2.11, 3.3.6, 3.4.7, 3.4.8, 3.4.9, 3.4.10, 3.5.0, 3.5.1, 3.4.11, 3.3.9, 3.2.14, 3.5.2, 3.4.12, 3.3.10, 3.2.15, 3.1.15, 3.2.12, 3.2.13, 3.3.7, 3.3.8, 3.5.3, 3.4.13, 3.3.11, 3.2.16, 3.2.17, 3.3.12, 3.4.14, 3.5.4, 3.2.18, 3.3.13, 3.4.15, 3.5.5, 3.2.19, 3.3.14, 3.4.16, 3.5.6, 3.4.17, 3.5.7, 3.5.8, 3.4.18, 3.3.15, 3.2.20, 3.2.21, 3.3.16, 3.4.19, 3.5.9, 3.2.22, 3.3.17, 3.4.20, 3.5.10, 3.6.0, 3.3.18, 3.4.21, 3.5.11, 3.6.1, 3.6.2, 3.5.12, 3.4.22, 3.3.19, 3.6.3, 3.5.13, 3.4.23, 3.3.20, 3.6.4, 3.5.14, 3.4.24, 3.3.21, 3.7.0, 3.6.5, 3.5.15, 3.4.25, 3.3.22, 3.7.1, 3.6.6, 3.5.16, 3.4.26, 3.7.2, 3.7.3, 3.6.7, 3.5.17, 3.4.27, 3.7.4, 3.6.8, 3.5.18, 3.4.28, 3.8.0, 3.4.29, 3.5.19, 3.6.9, 3.7.5, 3.5.20, 3.6.10, 3.7.6, 3.8.1, 3.5.21, 3.6.11, 3.8.2, 3.7.7, 3.5.22, 3.6.12, 3.7.8, 3.8.3, 3.6.13, 3.7.9, 3.8.4, 3.5.23, 3.8.5, 3.7.10, 3.6.14, 3.5.24, 3.5.25, 3.6.15, 3.6.15, 3.6.15, 3.7.11, 3.8.6, 3.9.0, 3.9.1, 3.8.7, 3.7.12, 3.6.16, 3.9.2, 3.10.0, 3.6.17, 3.6.18, 3.7.13, 3.7.14, 3.8.8, 3.8.9, 3.10.1, 3.9.3, 3.10.2, 3.7.15, 3.8.10, 3.9.4, 3.10.3, 3.7.16, 3.8.11, 3.9.5, 3.10.4, 3.10.5, 3.7.17, 3.8.12, 3.9.6, 3.7.18, 3.8.13, 3.9.7, 3.10.6, 3.7.19, 3.8.14, 3.9.8, 3.10.7, 3.10.8, 3.11.0, 3.11.1, 3.7.20, 3.8.15, 3.9.9, 3.8.16, 3.9.10, 3.10.9, 3.11.2, 3.11.3, 3.8.17, 3.9.11

Source code repository url github.com

User manual url www.postfix.org, manpages.debian.org

📊 Search Metrics

Difficulty 44/100

CPC $22.16

Competition 0.00

External References (29)

Alternativeto software id postfix

Arch linux package postfix

Archwiki article Postfix, Postfix_(Español)

Bibliothèque nationale de france id 14580406d

Debian source package postfix

Debian stable package postfix

Encyclopædia britannica online id topic/postfix

Fedora package postfix

Free software directory entry postfix

Freebase id /m/04nh2c

Freebsd port mail/postfix, mail/postfix-current, mail/postfix-current-sasl

Gentoo package mail-mta/postfix

Gentoo wiki article Postfix

Gnd id 4712839-2

Idref id 081571917

Library of congress authority id n2001014177

Macports port mail-server

National library of israel j9u id 987007364980505171

Netbsd package id mail/postfix

Nl cr aut id ph290649

Open hub id postfix

Openbsd port mail/postfix, mail/postfix/stable, mail/postfix/snapshot

Opensuse package postfix

Pro-linux.de dbapp id 3498

Repology project name postfix

Sill software id 116

Slackbuilds package network/postfix-pgsql

Ubuntu package postfix

Viaf cluster id 182794383

🌐 Available in 21 languages

enPostfix (software) csPostfix dePostfix (Mail Transfer Agent) esPostfix faپست‌فیکس fiPostfix frPostfix hePostfix idPostfix itPostfix jaPostfix ko포스트픽스 (소프트웨어) nlPostfix (computerprogramma) noPostfix plPostfix ptPostfix ruPostfix svPostfix (e-postserver) trPostfix ukPostfix zhPostfix

🏷️ Also known as

es IBM Secure Mailer es VMailer fa پست فیکس

🔗 Connections

Operating system 3

macOS, Unix-like operating system, BSD

Instance of 2

free software, message transfer agent

IBM Public License

Creator 1

Wietse Venema

Developer 1

IBM

Readable file format 1

Maildir

← Based on 1

YunoHost

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Postfix. Retrieved May 3, 2026, from https://4ort.xyz/entity/postfix

MLA “Postfix.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/postfix.

BibTeX

@misc{4ortxyz_postfix_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Postfix}}, year = {2026}, url = {https://4ort.xyz/entity/postfix}, note = {Accessed: 2026-05-03}}

LLM prompt

According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Postfix — https://4ort.xyz/entity/postfix (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/postfix · Last refreshed: May 3, 2026

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

3d ago · Github-wiki-bot bot · 2026-05-18 view diff on Wikidata ↗

Software version identifier → 3.0.2, 3.0.3, 3.1.0 +266

"/* wbsetclaim-create:1||1 */ [[Property:P348]]: 3.8.17, Update with GitHub data ([[:toollabs:editgroups/b/CB/2b6d11566eed|details]])"
4d ago · Mindmatrix · 2026-05-16 view diff on Wikidata ↗

Software version identifier → 3.0.2, 3.0.3, 3.1.0 +266

"/* wbsetclaim-update:2||1|2 */ [[Property:P348]]: 3.11.3"
19d ago · Github-wiki-bot bot · 2026-05-02 view diff on Wikidata ↗

Slackbuilds package → —

Freebase id → /m/04nh2c

Viaf cluster id → 182794383

Instance of → message transfer agent, free software

+ 86 other properties edited (see Wikidata diff for full list)

"/* wbsetclaim-create:1||1 */ [[Property:P348]]: 3.8.16, Update with GitHub data ([[:toollabs:editgroups/b/CB/b67efbefc0d9|details]])"

Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.

Postfix

Postfix

Summary

Key Facts

Body

Authorship and Creation

Why It Matters

Related Entities

References

Direct Wikidata claims

Class ancestry

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