Editing Comparison of email clients (section)

==General==
Basic general information about the clients: creator/company, O/S, license, and interface.

{{legend|#f4e3ff| No longer in active development}}

{{sticky header}}
{| class="wikitable sortable sticky-header"
|-
! Client
! Author/Developer
! [[#Operating system support|Operating system]]
! [[Software license]]
! User Interface
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| [[University of Washington]]
| [[Cross-platform]]
| {{open source|[[Apache License|Apache-2.0]]}}
| [[text user interface|TUI]]
|-
! {{rh}} | [[Apple Mail]]
| [[Apple Inc|Apple]]
| [[macOS]], [[iOS]], [[watchOS]]
| {{Proprietary}}
| [[graphical user interface|GUI]] ([[Cocoa (API)|Cocoa]]) 
|-
! {{rh}} | [[Balsa (email client)|Balsa]]
| Stuart Parmenter
| [[Linux]]
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| [[graphical user interface|GUI]] ([[GTK]]3)
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| Rimarts
| [[Microsoft Windows|Windows]]
| {{Proprietary}}
| [[graphical user interface|GUI]]
|-
! {{rh2}} | [[BlitzMail]]
| [[Dartmouth College]]
|
| {{open source|[[BSD licenses]]}}
| GUI
|-
! {{rh}} | [[Canary Mail]]
| Cartasec Pte. Ltd.
| Cross-platform
| {{Proprietary}}
| GUI
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| citadel.org
| [[Unix-like]]
| {{open source|[[GNU General Public License|GPL-3.0-only]]}}
| [[Webmail]]
|-
! {{rh}} | [[Claws Mail]]
| the Claws Mail team
| Cross-platform
| {{open source|[[GNU General Public License|GPL-3.0-or-later]]}}
| [[graphical user interface|GUI]] ([[GTK]]2)
|-
! {{rh2}} | [[Courier (email client)|Courier]] <small>(formerly Calypso)</small>
| Micro Computer Systems, Inc., continued by Rose City Software
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Elm (email client)|Elm]]
| Dave Taylor, Sydney Weinstein, Bill Pemberton, Michael Elkins, Kari Hurtta
| Unix-like
| {{open source|BSD-like}}<ref>[http://www.elmme-mailer.org/NOTICE Elm Mail System GPL]</ref>
| TUI
|-
! {{rh}} | [[eM Client]]
| eM Client Inc.
| Windows, macOS, Android, iOS
| {{proprietary}}
| GUI
|-
! {{rh}} | [[EmailTray]]
| Internet Promotion Agency S.A.
| [[Windows]], [[Android (operating system)|Android]]
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Eudora OSE]]
| [[Qualcomm]]
| Windows, [[macOS]]
| {{open source}}
| GUI
|-
! {{rh}} | [[GNOME Evolution|Evolution]]
| [[The GNOME Project]]
| [[Unix-like]]
| {{open source|[[GNU Lesser General Public License|LGPL-2.1-only or LGPL-3.0-only]]}}
| GUI ([[GTK]])
|-
! {{rh}} | [[FirstClass]]
| Open Text
| 
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Forté Agent]]
| Mark Sidell
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Geary (e-mail client)|Geary]]
| [[The GNOME Project]] (formerly [[Yorba Foundation]])
| Unix-like
| {{open source|[[GNU Lesser General Public License|LGPL-2.1-or-later]]}}
| GUI ([[GTK]])
|-
! {{rh}} | [[GNUMail]]
| Ludovic Marcotte and others
| Unix-like, macOS
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| GUI
|-
! {{rh}} | [[Gnus]]
| Gnus team
| Cross-platform
| {{open source|[[GNU General Public License|GPL-3.0-or-later]]}}
| TUI and GUI
|-
! {{rh}} | [[GroupWise]]
| [[Micro Focus]] (formerly [[Novell]])
| Cross-platform
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| Hiri
| Cross-platform
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Scribe Mail|i.Scribe, InScribe]]
| Memecode
| Windows, macOS, Linux
| {{open source|[[GNU General Public License|GPL-3.0-only]]}}
| GUI
|-
! {{rh}} | [[HCL Notes]] (formerly IBM Notes and IBM Lotus Notes)
| HCL Technologies (formerly [[IBM]] and [[Lotus Software]]), [[HCL Technologies]]
| Windows, macOS, Linux
| {{proprietary}}
| GUI (Notes), Web (Verse, iNotes) and Mobile (Traveler)
|-
! {{rh}} | [[Internet Messaging Program|IMP]]
| Horde LLC
| Cross-platform
| {{open source|[[GNU General Public License|GPL-2.0-only]]}}
| [[Webmail]]
|-
! {{rh}} | [[K-9 Mail]]
| K-9 Dog Walkers: cketti, et al.
| Android
| {{open source|[[Apache License|Apache-2.0]]}}
| GUI
|-
! {{rh}} | [[KMail]]
| [[KDE]]
| Cross-platform
| {{open source|[[GNU General Public License]]}}
| GUI ([[Qt (software)|Qt]])
|-
! {{rh}} | [[Mail (Windows)]]
| Microsoft
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Mailbird]]
| [[Mailbird]]
| Windows
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Mailpile]]
| [[Mailpile]]
| Windows, macOS, Linux
| {{open source|[[GNU Affero General Public License|AGPL-3.0-or-later]]}}
| [[Webmail]]
|-
! {{rh}} | [[mailx]]
| {{dunno}}
| Unix-like
| {{open source|[[BSD Licenses]]}}
| TUI
|-
! {{rh2}} | [[Microsoft Entourage]]
| [[Microsoft]]
| macOS
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Microsoft Outlook]]
| Microsoft
| Windows, macOS
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| [[Mozilla Foundation]]
|
| {{open source|[[Mozilla Public License]]}}
| GUI ([[XUL]])
|-
! {{rh}} | [[Mozilla Thunderbird]]
| Mozilla Foundation
| [[Cross-platform]]
| {{open source|[[Mozilla Public License|MPL-2.0]]}}
| GUI ([[XUL]])
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| Cyrus Daboo (formerly Cyrusoft International, Inc./ISAMET)
| Cross-platform
| {{open source|[[Apache License|Apache-2.0]]}}
| GUI
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| Michael Elkins
| Cross-platform
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| [[Text-based user interface|TUI]] ([[ncurses]])
|-
! {{rh2}} | [[Netscape Messenger]]
| [[Netscape Communications]]
|
| {{dunno}}
| GUI
|-
! {{rh2}} | [[Netscape Messenger 9]]
| Netscape Communications
|
| {{open source|[[Mozilla Public License]]}}
| GUI
|-
! {{rh2}} | [[Nylas Mail]]
| Nylas
|Windows, macOS, Linux
| {{open source|[[MIT License|MIT]]}}
| GUI
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| [[RAND Corporation]]
| Unix-like
| {{open source|[[BSD Licenses]]}}
| [[Command-line interface|CLI]]
|-
! {{rh}} | Opera Mail
| [[Opera Software]]
| Cross-platform
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Outlook Express]]
| Microsoft
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Pegasus Mail]]
| [[David Harris (software developer)|David Harris]]
| Windows
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| [[University of Washington]]
| Cross-platform
| {{proprietary|Freeware}}<ref>{{Cite web |url=http://www.washington.edu/pine/overview/legal.html |title=Pine License |access-date=2006-02-24 |archive-url=https://web.archive.org/web/20180602121205/http://www.washington.edu/pine/overview/legal.html |archive-date=2018-06-02 |url-status=dead }}</ref>
| TUI
|-
! {{rh2}} | [[Pocomail]]
| Poco Systems
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[RoundCube]]
| The RoundCube Team
| Cross-platform
| {{open source|[[GNU General Public License|GPL-3.0-or-later]]}}
| [[Webmail]]
|-
!{{rh}} | [[Samsung Email]]
|[[Samsung Electronics]]
|Samsung, Android 8+
| {{proprietary}}
|GUI
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| SeaMonkey Council
| Cross-platform
| {{open source|[[Mozilla Public License|MPL-2.0]]}}
| GUI ([[XUL]])
|-
! {{rh}} | [[Spark (application)|Spark]]
| Readdle
| macOS
| {{proprietary}}
| GUI
|-
! {{rh}} | [[SquirrelMail]]
| The SquirrelMail Project Team
| Cross-platform
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| [[Webmail]]
|-
! {{rh}} | [[Superhuman (email client)|Superhuman]]
| Rahul Vohra
| Cross-platform
| {{proprietary}}
| [[Webmail]]
|-
! {{rh2}} | [[Sylpheed]]
| Hiroyuki Yamamoto
| [[Cross-platform]]
| {{open source|Sylpheed: [[GNU General Public License|GPL-2.0-or-later]]<br />LibSylph: [[GNU Lesser General Public License|LGPL-2.1-or-later]]}}
| GUI ([[GTK]]2)
|-
! {{rh}} | [[The Bat!]]
| RitLabs
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Trojitá]]
| [[KDE]]
| Cross-platform
| {{open source|[[GNU General Public License|GPL-2.0-only]] or [[GNU General Public License|GPL-3.0-only]]}}{{r|group=Note|LicenseRef-KDE-Accepted-GPL}}
| GUI ([[Qt (software)|Qt]])
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| [[Demon Internet|Thus PLC (Demon Internet)]]
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Vivaldi_(web_browser)|Vivaldi]]
| [[Vivaldi_Technologies|Vivaldi Technologies AS]]
| Cross-platform
| {{proprietary}}
| GUI (Chrome)
|-
! {{rh2}} | [[Windows Live Mail]]
| Microsoft
| Windows
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Windows Mail (Vista)]]
| Microsoft
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| YAM Open Source Team and contributing authors
| [[AmigaOS]]
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| GUI
|-
! {{rh}} | [[Zimbra|Zimbra Desktop]]
| [[Zimbra]]
| Cross-platform
| {{open source|[[Mozilla Public License]] for server and [[Zope Public License|ZPL]] for client}}
| GUI
|-class="sortbottom"
! Client
! Author/Developer
! Operating system
! Software license
! User interface
|}

{{reflist|group=Note|refs=
<ref name="LicenseRef-KDE-Accepted-GPL">Or LicenseRef-KDE-Accepted-GPL: "''Any later version accepted by the membership of KDE e.V. (or its successor approved by the membership of KDE e.V.), which shall act as a proxy defined in Section 14 of version 3 of the license.''"</ref>
}}