Best Open Source Linux Post-Office Software 2026

Post-Office Software for Linux

Post-Office Linux Polish Clear Filters

Browse free open source Post-Office software and projects for Linux below. Use the toggles on the left to filter open source Post-Office software by OS, license, language, programming language, and project status.

Auth0 B2B Essentials: SSO, MFA, and RBAC Built In
Unlimited organizations, 3 enterprise SSO connections, role-based access control, and pro MFA included. Dev and prod tenants out of the box.

Auth0's B2B Essentials plan gives you everything you need to ship secure multi-tenant apps. Unlimited orgs, enterprise SSO, RBAC, audit log streaming, and higher auth and API limits included. Add on M2M tokens, enterprise MFA, or additional SSO connections as you scale.

Sign Up Free
Catch Bugs Before Your Customers Do
Real-time error alerts, performance insights, and anomaly detection across your full stack. Free 30-day trial.

Move from alert to fix before users notice. AppSignal monitors errors, performance bottlenecks, host health, and uptime—all from one dashboard. Instant notifications on deployments, anomaly triggers for memory spikes or error surges, and seamless log management. Works out of the box with Rails, Django, Express, Phoenix, Next.js, and dozens more. Starts at $23/month with no hidden fees.

Try AppSignal Free
1

Hastymail

Hastymail is a fast, secure, rfc-compliant, cross-platform IMAP/SMTP client application written in PHP providing a clean web interface for sending and reading E-mail. This version of Hastymail is no longer being developed. We are now working on a new version, Hastymail 3, AKA, "Cypht". http://cypht.org

2 Reviews

Downloads: 4 This Week

Last Update: 2013-12-31
See Project
2

P3Scan

P3Scan is a fully transparent scanning proxy-server for email clients. It provides scanning of incoming/outgoing email messages for Virus''s, Worms, Trojans, Spam, and harmfull attachments. It can also parse messages for web-bugs.

Downloads: 6 This Week

Last Update: 2013-04-17
See Project
3

Imap Mail Checker

Small program, which monitors email account via IMAPS (secure version of IMAP) protocol and inform user about new, unread messages. Coded in Java programming language.

Downloads: 2 This Week

Last Update: 2014-07-18
See Project
4

MailNotifer

Keep up to date with your mail! Notifications, easy configuration.

MailNotifer is written in GTK+, C++ Open Source application. It's easy to configure. The notifications are themeable. It supports IMAP protocol, SSL connections. For chcek mail it using my libMNMail. Developed in Poland. Supports 2 languages(by locale), Polish language works in about 30%. Easy to work. I can runs on Linux, but few functions must be changed. TODO list: -Make smart mail checking -Repair bugs -Add theme meanager -Add full support for Polish language -Make a Linux release and something else ;)

Downloads: 0 This Week

Last Update: 2015-08-03
See Project
Try Google Cloud Risk-Free With $300 in Credit
No hidden charges. No surprise bills. Cancel anytime.

Use your credit across every product. Compute, storage, AI, analytics. When it runs out, 20+ products stay free. You only pay when you choose to.

Start Free
5

PHPMyWebHosting (PMWH)

PHPMyWebHosting (PMWH) will provide a gui viewed in a browser, which lets you adminstrate postfix-sql-based (mySQL, PostGre) emailaddresses, Apache Virtual Hosts, DNS-zones etc. When completed, PHPMyWebHosting will provide a complete webhosting-Interface

Downloads: 0 This Week

Last Update: 2017-10-08
See Project
6

Virtual Qmail

Virtual Qmail - virtual domains management system for qmail. It is designed to be fast, reliable, and easy to use. Includes software allowing users to manage their accounts via WWW.

Downloads: 0 This Week

Last Update: 2013-03-21
See Project