When comparing Mailpile vs RainLoop, the Slant community recommends RainLoop for most people. In the question“What are the best self-hosted webmail clients?” RainLoop is ranked 1st while Mailpile is ranked 4th.
Ranked in these QuestionsQuestion Ranking
Pro Beautiful UI
Uncluttered, highly intuitive, easy to use user interface.
Pro Built-in rock-solid and easy-to-use encryption
Mailpile offers support for OpenPGP and S/MIME encryption and signatures in an easy to use manner.
Pro Theme support
The underlying architecture of Mailpile allows for themes that not only change the visual aesthetic of the client, but layout as well allowing for different UX designs.
Encryption is turned on by default.
The whole webmail client can be carried around on your external device (such as a USB stick) and used without having admin access to install.
Pro Free and open source
Licensed under AGPL.
Pro Good documentation
Pro Fast, scalable search engine
The search engine is at the very center of Mailpile. It was specifically designed to be able to handle large amount of e-mails without grinding the machine to a halt.
Additionally, the search includes a tagging feature that can automatically organize new mail by set rules or bayesian classifiers.
Pro Plugin architecture
Pro Internationalization support
Mailpile is available in over 40 languages.
Pro Two-factor authentication
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.
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.
Pro Good UI
Good UI make it a pleasing experience
Pro Free for personal and non-profit use
RainLoop is licensed under Creative Commons. Commercial use costs $85/yr.
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.
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.
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.
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.
Pro Add multiple accounts
You can add multiple accounts and switch between them.
Pro Keyboard shortcuts
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.
Pro Drag & drop support
RainLoop supports attaching files simply by dragging and dropping them in.
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.
Pro Google Drive integration
You can integrate Google Drive via API-Key for selecting attachments.
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.
Con Lack of API documentation
Most "closed" open source ever seen.
Con Very little bug fixes
Bugs aren't getting fixed.
Con Small community
No community forums, etc. This makes it difficult to find community help or just discuss techniques.
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.
Con Slow development
As of writing, the last update is quite a while ago. New features/security is not updated regularly
Con Too many js and ajax calls
Con Lack of documentation
Wiki is almost blank and no real installation instructions.
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.
Con Questionable start
The developer created RainLoop while working at AfterLogic. You can read more about it here.
Con No unified account view
Missing .htaccess file for the data folder.
Con Raises security concerns since it's written in PHP
The language itself and the library ecosystem has a bad security track record.