What is the best alternative to Kontact?
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It uses SQLite DB for storing email messages from all accounts in one single DB file. This makes it portable as in you can just copy one SQLite DB file and move your offline mail content to another PC/location. Also, one SQLite DB file for all messages means it is incredibly fast. See More
No real development since October 2017. This should be changed from a "Con" to a "Pro" as the Librem 5 smartphone has Geary as the default email application. There is ongoing development happening as can be seen at https://gitlab.gnome.org/GNOME/geary/commits/mainline 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
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