A free program for Windows, by Tim Grabinat.
What is WunderMail?
It is a new, unique, and very convenient way to check your Gmail.
How does it work?
You just need to install the WunderMail app, sign up with your Google Account, and you are ready to go.
You can do everything you expect from a mail app.
You can manage your inbox and folders.
You can add, delete and mark messages as read or unread.
You can send, receive and reply to emails.
You can also send attachments.
You can send or receive a message with a photo or an attachment.
You can send multiple emails to multiple recipients.
You can create email threads.
You can do anything you expect from a mail app and more.