NeoMail is described as 'web-based mail client that allows users to access their mail spools and send messages. It does not require a POP3 server, or any shell access for the users. It interfaces directly with user mail spools' and is an website in the Office & Productivity category. There are more than 10 alternatives to NeoMail, not only websites but also apps for a variety of platforms, including Mac, Self-Hosted solutions, Linux and iPhone. The best alternative is Apple Mail, which is free. Other great sites and apps similar to NeoMail are Roundcube (Free, Open Source), Horde (Free, Open Source), Polymail (Paid) and MailMate (Paid).
Roundcube webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, folder manipulation, message searching and spell checking.
Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.