Mails accessible via browser, including sending new mails and organising mails
Definition of webmail according to Wikipedia (en):
Webmail (or web-based email) is any email client implemented as a web application running on a web server. Examples of webmail software are Roundcube and SquirrelMail. Examples of webmail providers are AOL Mail, Gmail, Outlook.com and Yahoo! Mail. Practically every webmail provider offers email access using a webmail client, and many of them also offer email access by a desktop email client using standard email protocols, while many internet service providers provide a webmail client as part of the email service included in their internet service package. ProtonMail, founded at the CERN research facility in 2013, is a Web-based email service which automatically provides secure encryption.