i.Scribe (InScribe) is described as 'InScribe is a small and fast email client with an intergrated contact database and calendar' and is an app in the Office & Productivity category. There are more than 25 alternatives to i.Scribe (InScribe) for a variety of platforms, including Windows, Mac, Linux, iPhone and BSD. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like i.Scribe (InScribe) are Microsoft Office Outlook (Paid), Evolution (Free, Open Source), eM Client (Freemium) and Apple Mail (Free).
Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power and flexibility to manage even the most demanding workloads.
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.