^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."
^Becky! requires FRNews or BkNews plugin installed for handling NNTP.
^ abi.Scribe / InScribe requires a plugin to handle LDAP.
^KDE supports Newsgroups (NNTP) by the use of KNode
^ abcdPegasus Mail can convert Newsgroup messages and/or RSS feeds to emails through the use of free add-ons.
^Selective Download filters can skip/delete messages on POP3 server based on header (sender, recipient, subject, etc) information, this doesn't require to retrieve the full message body from the server.
^Message Dispatcher allows the user to decide which messages should be retrieved, deleted or skipped based on the header information (sender, recipient, subject, etc) displayed to the user.
^The Bat! requires MyGate plugin installed for handling NNTP.
^ abcdBecky! requires BkBlogReader or BkRSSviewer or B.F.R or BkRssReader plugin installed for handling RSS and ATOM.
^ abcRSSyl plugin is required to read RSS and ATOM in Claws Mail.
^vCalendar plugin is required to handle iCalendar in Claws Mail.
^ abcThe evolution-rss plugin (provided as a separate package by many distributions provides the RSS functionality in Evolution.
^Studio Blog Reader is one RSS reader application for IBM Lotus Notes. IBM Lotus Notes version 8.x introduced a native RSS reader.
^ abcdThe Bat! versions prior to 6.3 required rss2mail or rss2pop3 plugin installed for handling RSS and ATOM. The Bat! versions 6.3 and later have built-in support for RSS.
^ abcOpera Mail does not support STARTTLS command on special ports, like 995 for pop3 connection
^ abSince version 4.2, The Bat! supports two modes of X.509 certificate handling: Internal Implementation and via Microsoft CryptoAPI. CRLs and OCSP are only supported in the latter mode during TLS connections.
Features
Information on what features each of the clients support.
General features
For all of these clients, the concept of "HTML support" does not mean that they can process the full range of HTML that a web browser can handle. Almost all email readers limit HTML features, either for security reasons, or because of the nature of the interface. CSS and JavaScript can be especially problematic.
^Although Thunderbird supports UTF-8, its handling of line wraps causes problems with long lines of text that don't contain spaces, which essentially makes it unusable for certain languages (e.g. Chinese, Japanese, Korean) [2]
^Mozilla Thunderbird adds this feature in Thunderbird 1.5.0.4
^ abcUsing PGP in Thunderbird before version 78 requires Enigmail.
^ abcPGP/GPG and S/MIME support require a free (included) plugin.
^Sylpheed has some limited ability to show HTML email. It can show the plain text that's left after stripping away all the HTML tags. Sylpheed has no ability to compose HTML.
^ abcThe Bat! supports two modes of S/MIME: Internal Implementation and via Microsoft CryptoAPI.[44] CRLs and OCSP are only supported in the latter mode. Internal implementation only supports Aladdin eToken Pro or Rainbow iKey1000[45] tokens and can import certificates (from PKCS#12/PFX format) which were created outside The Bat!. CryptoAPI supports any kind of tokens and smart cards which have a corresponding Cryptographic Service Provider installed.
^ abIt's a frequent problem for people dealing with Cyrillic/Russian in email messages that the message is not encoded in the encoding declared in its headers and thus can't be read. With such a message (with a wrong declaration of the encoding), it well might be the case that it passed through several incorrect recoding stages while it was being sent and delivered; thus it's not possible to correctly render it and read it if one uses the common type of the interface for choosing the encoding (such as the menu in Mozilla Firefox). An example of such a complex case of a wrongly declared encoding: a message was entered through a webform in the windows-1251 encoding, but the web interface incorrectly assumed that it was in latin-1; based on this assumption, it performed the recoding from latin-1 to utf-8. The result of this operation cannot be correctly decoded through the common encoding-selection interface; it can only be decoded through a two-stage recoding: first from utf-8 to latin-1, then from windows-1251 to utf-8 (assuming that one works in a Unicode environment). After it is decoded, it is desirable to store it in the recoded form instead of the original, in order to be able to read it easily afterwards, and to quote it for replies.
^i.Scribe / InScribe supports full integration with GNU Aspell, which is its requirement for spell checking.
^Starts replies with cursor at top, but is configurable regarding whether to include a blank space at the top for replies or not; some interleaved-posting users prefer starting the cursor at the top so they can trim the quotes
^The recoding engine and interface extensions that would solve the described recoding problems have been developed as a patch for Pine; it is to be found in the package pine-4.58L-alt4.src.rpmArchived 2011-08-27 at the Wayback Machine(ftp) for ALTLinux (under the name pine-4.58L-alt2-0.4.1.diff). Its essential feature is to enable to forcibly recode messages, save them in the recoded form, and quote in replies.
^Pine supports full integration with GNU Aspell or other external speller, which is its requirement for spell checking.
^ abFragmented messages make it possible, for example, to send a large audio message as several partial messages, and still have it appear to the recipient as a simple audio message rather than as an encapsulated message containing an audio message. RFC2046
^ abSearch Folders are virtual folders that contain views of all email items matching specific search criteria. Search Folders display the results of previously defined search queries.
^Editable keybindings is part of GNOME, provided "Editable menu accelerators" is enabled in GNOME's "Menus & Toolbars" control applet.
^Fragmented messages are called truncated document in Lotus Notes.
^With Entourage 2008, you can use AppleScript and various internal/external scheduling mechanisms to create timed backups of Entourage Data.
^With Entourage 2008 and later versions of 2004, you can use the Spotlight data to search what's in the Entourage database via regular expression in the file system in Terminal or via Spotlight's ...interesting...version of "regular expressions".
^Thunderbird's interface can be user customized via the use of themes (which can reposition and skin controls)
^This is for Mulberry's 'offline browsing' capability, which is turned off by default. In the default configuration no local copy of the mail is created.
^ abcdMulberry is a dedicated IMAP client; If the IMAP server has these abilities, Mulberry can use them.
^ abBecause MH stores each letter in a separate file, it is trivially easy to (externally) search them with grep. This ease is shattered when non-raw encodings are used, such as base64.
^The Bat! Pro support two methods access to program when database is encrypted: password authorization and token authorization; Voyager support only password authorization and encrypted database is default and only available storage method.
Templates, scripts and programming languages
Client
Message templates
Message templates individual for
Support in message templates scripts, programming languages
^(setq gnus-select-method '(pop3 "pop.example.com")) (setq gnus-secondary-select-methods '((nntp "news.gnus.org"))) After configuring Gnus for POP3, you can use the gnus-group-get-new-news command to retrieve new messages from your POP3 server.
