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4.7 star rating
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Mu4e
All
5
Experiences
Pros
5
Top
Pro
UI optimized for speed
The UI is designed to allow for quick keystrokes to get around and is pretty clean. Header View: Message View:
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Pro
Asynchronous
Heavy actions never block emacs, unlike most other emacs email clients.
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Top
Pro
Fully Search Based
Mu4e has no folders or other organizational tools, rather it relies on very fast search queries to help you find your mail.
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Top
Pro
Can write rich text emails
Using the (beta) org mode, Mu4e can compose fully rich text emails.
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Top
Pro
Built-in Autocomplete
Doesn't require you to import address books for autocomplete, learns from your emails just like Gmail.
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FREE
67
3
AfterLogic WebMail
All
15
Experiences
Pros
11
Cons
4
Top
Pro
Branding
In admin panel you can supply separate logos for login screen and for top-left corner of main interface.
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Top
Con
Horrible instructions
They don't proceed in any logical order, omit significant steps and contain useless stuff like: "Another critical part of setting up the product is configuring database settings. It's assumed that you already have a database created, fill in the connection details, press Save, then you can Create Tables."
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Top
Pro
Multilanguage, with autodetection
Interface is available in over 30 languages. WebMail attempts to determine your system language and open the interface in it.
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Top
Con
Not responsive at all
3 layers of Mail section overlying each other. Totally not supported by mobile. Very bad mobile interface.
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Top
Pro
Autorefresh
Configurable autoreload of email message list every N minutes
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Top
Con
No Unified inbox
They planned it for a while, but for now, it's still working with one account at a time.
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Top
Pro
Drag 'N Drop
Mails can be dragged into a different folder, contacts can be added into group, events in calendars can be tossed around, etc. - all with drag 'n drop.
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Top
Con
No CardDAV support in free version
CardDav Sync is not available in AfterLogic WebMail Lite, which is the free version.
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Top
Pro
Mobile version of interface
Open WebMail on your iOS or Android device to get a simplified mobile interface. And when run on iOS, it'll offer you to get iOS profile with settings for mail access, contacts and calendar sync.
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Top
Pro
Plugins infrastructure
A few dozens of plugins, some of those created by community. Plugins are placed into data directory so they survive upgrades easily.
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Pro
External services integration
Twitter, Facebook, Google and Dropbox are supported. With last two, you can access their file storage; and you can use social account credentials to log into your WebMail acct.
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Top
Pro
Sync with Windows, iOS, Android, etc.
Offers syncing through DAV with mobile devices, there are also mobile apps and Windows sync client.
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Top
Pro
Multiple accounts
In WebMail Pro each user can have multiple accounts added to switch between them and use them separately.
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Pro
Available in multiple editions
In addition to commercial WebMail Pro, simplified free opensource WebMail Lite is available. Also there are MailSuite Pro (which is basically WebMail Pro integrated with mailserver software) and Aurora, extended with groupware features.
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Top
Pro
Simple
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Experiences
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32
5
Taiga
All
13
Experiences
Pros
9
Cons
3
Specs
Top
Pro
Supports both Kanban and Scrum modes
User stories can be organized in both Kanban and Scrum task management systems.
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Top
Con
No Kanban metrics
Taiga is said to support Kanban but it does not generate any of the usual Kanban metrics (cycle time, lead time) or graph (Cumulated Flow Diagram).
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Top
Pro
Free and open source 
Taiga is licensed under GPL with source code available on GitHub.
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Top
Con
Can be overwhelming at first 
Taiga presents users with a lot of information and functionality right from the beginning with little guidance. Figuring how stuff works might take a bit.
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Top
Pro
Simple to use
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Top
Con
Too much functionality for small projects 
While it's possible to disable any unwanted features (modules), the amount of functionality that's present might be more than a small, short-term project needs.
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Top
Pro
Comprehensive Agile software development toolset 
Taiga tries offering a complete Agile software development toolset. It includes complete solutions for issue tracking, videoconferencing, documentation (in the form of a wiki) and either a backlog or a Kanban board for managing user stories.
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Top
Pro
Built-in issue tracking  
Taiga has built-in issue tracking tools. The issues can be organized by user-defined type, severity, priority, creation date, assignee, creator, tags as well as filtered by subject. Taiga can also integrate with GitHub, GitLab and BitBucket.
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Top
Pro
Built-in wiki 
Each project has a wiki. It has Markdown support as well as a WYSIWYG editor.
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Top
Pro
Built-in video conferencing tools 
Integrates with either AppearIn or Talky to provide a video conferencing solution.
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Top
Pro
Migration from RedMine
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Pro
Export/Import feature
You can extract all your data from one Taiga instance and move it to another one. You can read more here.
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Specs
Platforms:
Web, macOS, iOS, Android, Linux
Technology:
Python, CoffeeScript
API:
Yes
Collaborative:
Yes
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Experiences
$0-5/MO
42
8
Tutanota Mail
All
15
Experiences
Pros
11
Cons
3
Specs
Top
Pro
End to end encryption
End-to-end encrypted: internal emails (between Tutanota users) external emails: requires setting a password and sharing it separately to the recipient calendar contacts email storage email subject lines
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Top
Con
No support for third-party clients (eg Thunderbird...)
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Top
Pro
Open source
See here.
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Top
Con
Doesn't support PGP encryption
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Top
Pro
Based in Germany
Tutanota's servers are located in Germany, which has strict privacy protection laws, even stronger than those of Switzerland.
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Top
Con
No support for IMAP and SMTP
You can't use your favorite email client.
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Top
Pro
Anonymous: no personal information and no phone numbers are required to register
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Top
Pro
F-Droid app
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Top
Pro
No offices in the USA
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Top
Pro
Free
A free account is available.
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Top
Pro
Add free
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Top
Pro
Desktop client
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Top
Pro
U2F for second factor authentication
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Top
Pro
Affordable price for paid plans
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Specs
Platforms:
Windows, Linux, Mac, Mobile, Web
Technology:
TypeScript, C
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Experiences
Free / Premium
120
27
RainLoop
All
30
Experiences
Pros
17
Cons
13
Top
Con
Abandoned
Use Snappymail instead which replaces this. It is bad to be recommending RainLoop in 2023
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Top
Pro
Two-factor authentication
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Top
Con
Lack of API documentation
Most "closed" open source ever seen.
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Top
Pro
No database backend (except for contacts)
Except for contacts (which are optional), RainLoop does not require a database to run, allowing for easier management and configuration.
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Top
Con
Very little bug fixes
Bugs aren't getting fixed.
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Top
Pro
Easy to apply your own branding
Not only can you change the title, description and logo with a simple form in the admin panel, you can also completely customize the look of the login screen by supplying your own custom stylesheet.
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Top
Con
Small community
No community forums, etc. This makes it difficult to find community help or just discuss techniques.
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Top
Pro
Good UI
Good UI make it a pleasing experience
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Top
Con
Lack of documentation on plugin development
RainLoop sends the user to a plugin example that is nonexistent (which they state will be filled in later), which means the user has to figure out what the process is on their own.
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Top
Pro
Free for personal and non-profit use
RainLoop is licensed under Creative Commons. Commercial use costs $85/yr.
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Top
Con
Slow development
As of writing, the last update is quite a while ago. New features/security is not updated regularly
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Top
Pro
Client-side OpenPGP
RainLoop supports an easy to use client-side OpenPGP encryption. It allows setting up, importing and generating keys from the admin panel. OpenPGP keys are stored in the browser's local storage.
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Top
Con
Too many js and ajax calls
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Top
Pro
Easy to update
RainLoop can be updated from the admin panel. It does not require manually downloading, overwriting or configuring anything with each update.
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Top
Con
Lack of documentation
Wiki is almost blank and no real installation instructions.
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Top
Pro
Social network authentication
RainLoop integrates with Facebook, Google, and Twitter for authentication. You can find out how to set up each of the services here.
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Top
Con
Free version very limited
You can't change nothing with free version. Neither add your image logo on login screen. You can't change the templates, can't change the form to send mail.
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Top
Pro
Configurable multi-level caching system
RainLoop caches messages to allow quicker access to your mailbox and to alleviate the strain put on the server. You can choose to disable it completely if you don't want it. Or, you can configure cache settings such as an additional caching key, browser-level cache, caching message user IDs while searching, etc. Even changing memcache hosts and ports and caching system data is possible.
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Top
Con
Questionable start
The developer created RainLoop while working at AfterLogic. You can read more about it here.
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Top
Pro
Add multiple accounts
You can add multiple accounts and switch between them.
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Top
Con
No unified account view
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Top
Pro
Keyboard shortcuts
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Top
Con
Security
Missing .htaccess file for the data folder.
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Top
Pro
Dropbox integration
RainLoop allows attaching files from Dropbox. To enable this feature, go to Dropbox's developer apps page to register your app. You'll receive the app key value to enter in the admin panel.
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Top
Con
Raises security concerns since it's written in PHP 
The language itself and the library ecosystem has a bad security track record.
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Top
Pro
Drag & drop support
RainLoop supports attaching files simply by dragging and dropping them in.
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Top
Pro
Multilingual
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Top
Pro
Plugin support
RainLoop has an easy to use plugin system. You can find the full list of plugins in the admin panel (or see their code on GitHub). From the admin panel, you can, in a simple, user-friendly way, manage them - install, uninstall, update. Unfortunately, a number of plugins and the related documentation, currently, is somewhat lacking.
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Top
Pro
Google Drive integration
You can integrate Google Drive via API-Key for selecting attachments.
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Top
Pro
RainLoop plus Xeams
Complimented modern user interface to deliver mail from Xeams. Setting up both applications takes less than an hour on private server.
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Experiences
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239
56
Discourse
All
22
Experiences
Pros
16
Cons
5
Specs
Top
Pro
Has a built-in immune system from trolls, spammers and bad actors
Discourse has a simple user trust system that makes moderating the forum a lot easier. Users gain more permissions as they gain more trust, which limits the amount of damage spammers and trolls can do. Discourse co-founder Jeff Atwood also founded StackExchange, which is the gold standard for gamification/moderation systems so you can also expect Discourse to get better and better at moderation.
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Top
Con
Complicated setup
Compared to standard PHP+MySQL apps, Discourse is more complicated - the app lives in a Docker container. However, a Docker image is available, which reduces the setup time to about 30 minutes.
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Top
Pro
100% free and fully open source
Discourse is powered by Ruby on Rails, Ember.js, PostgreSQL and Redis. The code is licensed under GPL and available on GitHub.
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Top
Con
Leaves out users with shared hosting
Discourse requires sudo, which is only available on a VPS.
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Top
Pro
Modern & polished UI/UX with lots of great smaller features
The best feature is its design: discourse is designed to aid in the creation of high quality online conversations. Flat discussions with well implemented quoting systems, expandable/collapsible replies, infinite scroll, clean UI and many more features come together to form a highly polished forum experience that makes legacy forums show their age.
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Top
Con
Bad noscript support
When using a Discourse forum without scripts the experience is greatly reduced. It's really hard to use and is read-only, meaning that one can't comment or create threads without scripts.
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Top
Pro
Helpful community
Discourse has a comprehensive forum culture support hub at meta.discourse.org.
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Top
Con
It is more "Free to Try" than really free
Discourse is open source free software. The hosting is where the costs come in. Discourse.org hosting starts at $100/mo, but you can pay as little as $5/mo on Digital Ocean or other cloud hosts.
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Top
Pro
Hosted and self-hosted solutions
You can host it yourself in a $5 cloud server or on any Linux server you already have. And if you don't want to deal with this, you can use the hosting platform from the development team.
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Top
Con
Extremely expensive hosting
Official discourse.org hosting starts at $100/mo and supports the team creating the software. It can also be hosted on a cloud service like Digital Ocean for $5/mo.
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Top
Pro
Live preview while editing the post
The post editor has a synchronized side-by-side preview of the Markdown rendering of the post.
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Top
Pro
User selectable themes
Users can choose between the themes made avaliable on their instances, and even use different themes on different devices (mobile vs desktop, for example).
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Top
Pro
Export your posts
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Top
Pro
Effective search
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Top
Pro
Good to go out of the box yet infinitely tweakable
Discourse has sane, safe out of the box defaults, but a million dials and knobs to tweak.
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Top
Pro
Easy one-click upgrade
Discourse can upgrade itself with one click in the admin panel. Not the same can be said about MyBB, or most other forums.
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Top
Pro
Advanced JavaScript app
Runs in modern browsers and works identically on desktop and tablet and smartphone without the need for a native app.
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Top
Pro
Discussions can be organized in categories and tagged
Discussions can be tagged with an arbitrary number of tags, separately from categories. Categories are hierarchical and don't scale; tags do.
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Top
Pro
Official Akismet Anti-Spam Plugin
Official Akismet plugin vets posts by new users to make sure they don’t look spammy before they hit your site. Akismet key purchase required.
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Top
Pro
Extensible via plugins
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Top
Pro
Good on-boarding experience for new users
New users are greeted withe the disco bot which has an interactive experience to teach the basics of using Discourse.
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Specs
Written in:
Ruby on Rails, Ember, JavaScript
Databases:
PostgreSQL with Redis
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Experiences
FREE
163
53
ProtonMail
All
14
Experiences
Pros
5
Cons
8
Specs
Top
Pro
Built-in end-to-end encryption
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Top
Con
Javascript-intensive Webmail
Free accounts are required to use Javascript webmail and encryption is done in the browser. Javascript cryptography is harmful for security and should not be used.
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Top
Pro
No personal information needed
To create an account you don't need to give any personal information, just choose username, domain, and password. Even the recovery email address is optional.
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Top
Con
Encryption Keys are stored server-side
The keys are generated during account creation. Using your existing keys is prohibited and ProtonMail must store and control the private keys. Encryption cannot be secure unless the user controls the private keys.
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Top
Pro
Privacy respecting
User data is protected by strict privacy laws because all servers are located in Switzerland.
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Top
Con
Still lacks some useful features
At the moment, there is no calendar feature and contact management is quite poor. They will, however, start to work on it.
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Top
Pro
Open Source
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Top
Con
Ties to US Investors
ProtonMail takes money from US Investors
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Top
Pro
Mobile apps
Apps for Android and iOS available.
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Top
Con
No IMAP and SMTP support for basic accounts
Basic accounts are restricted to the Protonmail web client. Support for IMAP and SMTP is available with a paid subscription only, and as such with basic accounts it is not possible to send and receive email with external applications.
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Top
Con
Overly expensive for desktop support
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Top
Con
Requires phone number for login
If you sign up over Tor or a VPN, it will require email or phone number verification. Email verification is disabled if you use an email that isn't from Google or Outlook.
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Top
Con
Not fully Open Source
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Specs
End-to-end encryption:
Yes
Free tier:
Yes
Open source:
Yes
Web interface:
Yes
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Experiences
FREE+
181
65
SOGo
All
5
Experiences
Pros
5
Top
Pro
Drag and drop interface
Folders, contacts and events can be moved around with intuitive drag and drop functionality.
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Top
Pro
Calendaring and messaging data can be accessed via web and multiple desktop and mobile clients
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Top
Pro
Microsoft ActiveSync support
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Top
Pro
Localized
Available in 30 languages.
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Pro
Fully responsive
The UI is fully responsive, and works fine on desktop, tablets and phones.
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36
16
Squirrelmail
All
3
Experiences
Pros
2
Cons
1
Top
Pro
Very mature
Squirrelmail has been around for a long time.
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Top
Con
Very old
Squirrelmail has been around for a loooooong time!
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Top
Pro
Has many available plugins
Can do things like change Linux user passwords, configure vacation "out of office" messages, configure procmail .forward files, etc.
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19
11
Zimbra Web Client
All
3
Experiences
Pros
1
Cons
2
Top
Pro
Full-featured collaboration solution
If you are looking for an alternative to Gmail, look no further than Zimbra. While not a complete document solution it does have some document features as well.
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Top
Con
Heavy and monolithic
Zimbra doesn't much work with its host platform as much as it brings its own copies of utilities. If you want something small and "plays well with others" integratable...this is not it. Too heavy to run on a RaspberryPi if you're looking for something for just a few users.
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Con
Linux only
There is no installator for Windows
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16
15
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4.7 star rating
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