Roundcube

Product Overview:

Roundcube is a browser-based, multilingual IMAP client with an application-like user interface. It provides full functionality expected from an email client, including MIME support, address book, folder manipulation, message searching, and spell checking. With its plugin API, Roundcube is easily extendable, and the user interface is fully customizable using skins.

Main Features:

1. Drag-&-drop message management: Manage your emails with ease by dragging and dropping messages.
2. Full support for MIME and HTML messages: View and compose emails in various formats.
3. Multiple sender identities: Use different email addresses for sending emails.
4. Full featured address book with groups and LDAP connectors: Organize contacts and connect to external directories.
5. Find-as-you-type address book integration: Quickly find contacts as you type their names or email addresses.
6. Threaded message listing: View conversations in a threaded format.
7. IDNA and SMTPUTF8 support: Handle internationalized domain names and UTF-8 encoded messages.
8. Spell checking: Catch spelling errors before sending emails.
9. Responsive skin (multi-device support): Roundcube is optimized for various devices and screen sizes.
10. Shared/global IMAP folders: Access shared email folders with colleagues or family members.
11. Support for access control lists (ACL): Manage permissions for email folders and messages.
12. Built-in caching for fast mailbox access: Improve performance by caching frequently accessed data.
13. Unlimited users and messages: Roundcube supports an unlimited number of users and emails.
14. Import/export functions: Move emails between accounts or clients with ease.
15. Plug-in API for flexible extensions: Customize and extend the functionality of Roundcube.
16. XSS attack protection: Protect against cross-site scripting attacks.
17. Support for PGP encryption: Secure your emails using Pretty Good Privacy (PGP) encryption.

These features make Roundcube a comprehensive email client that can be used by individuals, teams, or organizations.