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Unfortunately, all interfaces of roundcube look very old. I hope there will be a progress soon, Google Mail and Outlook Webmail should be the role models here. But also Yahoo mail offers an intuitive design. If this open source software should survive, it must be completely renewed and bring up to new standards. See More
Roundcube allows third-party plugins and has a temporary plugin repository (until [the official plugin repository] (http://plugins.roundcube.net/) comes out of beta) with over a hundred plugins available, covering authentication, improved security and settings among many others categories. See More
Each contact can have their e-mail address, phone number, location, photos and associated URLs added to them. You can then group contacts and address your mails to the group instead of having to enter each person separately. Additionally, you can import vCards and CSV files as contact information. And, it has LDAP connectors. See More
You can use it for free, but even the paid plan starts incredibly cheap and allows you to add and remove features in a modular fashion. It's also the only encrypted mail provider offering an open source Android client at this time! Not only that, but it's available from F-Droid! I highly recommend Tutanota over competitors like ProtonMail and GMail if you care about software freedom and privacy. See More
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. See More