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When comparing st vs Claws Mail, the Slant community recommends Claws Mail for most people. In the question“What is the best desktop Email client for Windows 10?” Claws Mail is ranked 3rd while st is ranked 9th. The most important reason people chose Claws Mail is:
Claws Mail is a low resource e-mail client that is often default in low resource Linux distributions.
Specs
Question Ranking
Pros
Pro Low memory usage
st is built to serve as a lightweight terminal emulator. It's very light and doesn't require many resources to run, making it able to run well on older and low-end machines.
Pro Extremely simple architecture
st consists of a single C file that takes seconds to recompile. This also makes it very easy to understand and customize.
Pro 24-bit "True Color" support
st supports color escape sequences for a full 16 million 24-bit color spectrum, instead of the typical 256 colors.
Pro Support for fontconfig
There is full XFT (X Free Type interface library) and fallback font support through fontconfig in st. If your selected font is missing a certain glyph or symbol, but one of your other installed fonts has it, it will be shown.
Pro Copyfree licensing
Copyfree licensing implies that the user has the freedom to copy, use, modify, and distribute what he/she possesses.
Pro Image previews
Handles image previews (e.g. in ranger) way better than other terminal emulators.
Pro Patches are great
The patches on the site are great. Scroll back, hide the mouse, etc.
Pro Minimalist
Hackable and lightweight.
Pro Blazing fast
it is extremely responsive and fast, even on older computers.
Pro Clean
The terminal doesn't have any bloated features nobody uses. It is very minimal and extendable.
Pro Low resource client
Claws Mail is a low resource e-mail client that is often default in low resource Linux distributions.
Pro Open-Source
Pro Has many plugins for extra functionality
Pro Traditional user interface
Pro Clean interface with 5 layout variants
Pro Saves emails in uncompressed readable format
Allows one to read archived emails with a text editor.
Pro Has very strong filters
The filters a much stronger than in thunderbird.
Pro Saves passwords in encrypted format
Pro Has many themes
Pro Also supported on Windows
This makes switching the platform easier.
Pro Good support for Google's services
Cons
Con Configuration requires recompiling
Though recompilation takes seconds, knowledge of C header files is required for customization (though it's pretty easy to do for someone who knows how to edit config files).
Con Text is cut off when resizing windows
In the vanilla build, when reducing windows, lines do not wrap, they are cut off. When the window is made large again, some of the text is missing.
Con Crashes when some characters or colored fonts are displayed
Con No scrollback by default
The best way to perform scrollback is to use a multiplexer (such as tmux, screen, or dvtm) if you want scrollback and reverse-search support.
Con New features means installing patches
Just to get copy/paste support and scrolling, you have to install patches. And it's not that intuitive for a beginner.
Con Internal border/margins
Doesn't support internal margins.
Con Source code edits (aka configs) need to be redone after updating
Con Imperfect fontconfig support for CJK characters
It [st] doesn't seem to use CJK fonts provided by fontconfig while other programs use such fonts.
Con Blocks and freezes all the time
Con Saves passwords in plain format
Con Too much bloat
some people dont like the simple design of slypheed so they forked it and created claws mail but it has become so bloated since itsbeginnings.
Con Saves emails in uncompressed format
This takes more space on the HDD.
Con Interface looks old and setup is not easy
The icons as well as the rest of the interface look like an application from the early 90's, with this there is also no easy setup options built in like the more modern e-mail clients.
