Open Source Postler AlternativesEmail Clients and other similar apps like Postler
The best open source alternative to Postler is Thunderbird. If that doesn't suit you, our users have ranked more than 10 alternatives to Postler and ten of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Postler are Evolution, Geary, Claws Mail and Mutt.
Postler alternatives are mainly Email Clients but may also be Calendar Apps or Mail Servers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Postler.- 91 Thunderbird alternatives
- Email Client
- Calendar App
- Free • Open Source
- Mac
- Windows
- Linux
- BSD
- AppImageHub
- Snapcraft
- Flathub
- PortableApps.com
- Haiku
- Homebrew
- Chocolatey
Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
- - Thunderbird is the most popular Windows, Mac & Linux alternative to Postler.
- - Thunderbird is the most popular Open Source & free alternative to Postler.
Thunderbird Features
- Extensible by Plugins/Extensions
- Multiple Account support
- Calendar Integration
- Email Organizer
- Dark Mode
- OpenPGP
- Portable
- GPG Encryption
- Ad-free
- Works Offline
- Full-Text Search
- Mail Filtering
- Unified inbox
- No Tracking
- Import/Export OPML Feeds
- Support for Themes
- Integrated Password Manager
- PGP Encryption
- 79 Evolution alternatives
- Email Client
- Calendar App
- Free • Open Source
- Linux
- BSD
- Flathub
- S/MIME
- GNOME
- OpenPGP
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality. Evolution supports a wide range of industry standard data formats and network protocols for information exchange, with an emphasis on...
Evolution Features
- Calendar Integration
- Calendar View
- Spam Filter
- Multiple Account support
- Sync with Google Calendar
- Ad-free
- GPG Encryption
- Reminders
- 50 Geary alternatives
- Email Client
- Free • Open Source
- Linux
- BSD
- Flathub
- GNOME
- Flatpak
Geary is an email application built around conversations, for the GNOME 3 desktop.
Geary Features
- Multiple Account support
- Dark Mode
- Lightweight
- Spam Filter
- Ad-free
- Email Organizer
- Privacy focused
- 81 Claws Mail alternatives
- Email Client
- Calendar App
- Free • Open Source
- Windows
- Linux
- BSD
Claws Mail is an email client (and news reader), based on GTK+, featuring
Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability.
Claws Mail Features
- Lightweight
- Extensible by Plugins/Extensions
- Multiple Account support
- Spam Filter
- No registration required
- Ad-free
- Privacy focused
- Works Offline
- Portable
- Calendar Integration
- GPG Encryption
- Import/Export OPML Feeds
- End-to-End Encryption
- 57 Mutt alternatives
- Email Client
- Free • Open Source
- Mac
- Windows
- Linux
- Xfce
Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including...
Mutt Features
- PGP Encryption
- Command line interface
- 48 Sylpheed alternatives
- Email Client
- Free • Open Source
- Mac
- Windows
- Linux
- BSD
- PortableApps.com
Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).
Sylpheed Features
- Lightweight
- Portable
Sup is a console-based email client for people with a lot of email. It supports tagging, very fast full-text search, automatic contact- list management, custom code insertion via a hook system, and more.
sup Features
- Multiple Account support
- Command line interface
- 77 nPOPuk alternatives
- Email Client
- Free • Open Source
- Windows
- Windows Mobile
nPOPuk is an ultra-small, but comprehensive, e-mail client that runs on a wide range of Windows-based operating systems
nPOPuk Features
- Portable
- 70 iRedMail alternatives
- Mail Server
- Freemium • Open Source
- Linux
- BSD
- Self-Hosted
A fully fledged, free email server solution, an open source project (GPL v2).
Use official binary packages from Linux/BSD distributions, with both i386 and x86_64 support.
Easy, fast deployment in LESS THAN 1 MINUTE. View YouTube Video to check how easy it is.
Works on both no.
- - iRedMail is the most popular Self-Hosted alternative to Postler.
- 38 Mulberry alternatives
- Email Client
- Calendar App
- Free • Open Source
- Mac
- Windows
- Linux
Mulberry is a powerful, easy to use electronic mail (email) and calendar program that allows you to send, access, and manage email and calendars. Mulberry also helps you manage other related information, such as contact information.
Mulberry Features
DiscontinuedThe project is no longer developed. Last version, 4.0.8, released in February 2007, can be still downloaded from the official website.