Components
K-9 Mail open source one application features email client with support for multiple accounts,search,multi-folder sync available emails You can read gmail,yandex,yahoo other accounts control available simple and nice application
Proposal
I am suggesting a feature K-9 mail app add the Upgrade Notifications feature to let users know when the new version comes out 
>Upgrade Notifications
Mockups / Examples
This is the look of the current K-9 mail menu app
This is the look of the current K-9 mail Upgrade Notifications feature added menu
Also Notification menu Upgrade Notifications enable and disable feasible 
Benefits
Benefit from this feature, Users do not need to go to google play store elsewhere to search for newly realized version. Users will be able to know when this new version is done by doing so so they will not be left on new features and I think this feature will be very helpful in developing K-9 mail app
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