When comparing Mailpile vs PrivMX WebMail, the Slant community recommends Mailpile for most people. In the question“What are the best self-hosted webmail clients?” Mailpile is ranked 3rd while PrivMX WebMail is ranked 6th. The most important reason people chose Mailpile is:
Uncluttered, highly intuitive, easy to use user interface.
Ranked in these QuestionsQuestion Ranking
Pros
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.
Pro Secure
Encryption is turned on by default.
Pro Portable
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 Very easy to install
Easy install and did not conflict with postfix dovecot roundcube system on FreeBSD.
Cons
Con Can't send regular email
This appears to be completely standalone system, only users of PrivMX can send and receive mail from other users with PrivMX. You can't send email to regular @ email addresses, or presumably receive email from them either.