GeeMail - A Desktop Client for Gmail
GeeMail is a desktop client for Gmail based on Adobe AIR. It work on Windows, Mac and 
Linux. You don’t have to miss GeeMail on any OS platform when you need to switch temporarily or permanently. GeeMail is truly cross platform,as long as you have Adobe AIR installed.
It is a standalone application that you can use to check your email, send, or sort messages without opening a web browser.
You don’t need to configure POP and IMAP settings like traditional email clients.Also you can compose messages while you're offline . When you go online again, you can send that messages.
GeeMail | Freeware | 993 KB
SysReq: 
AdobeAIRInstaller| 14.9 MB | Windows, Mac and Linux
via CNet
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