Google added some updates to the gmail app for iOS devices. One of the newest features is the ability to add line drawings to emails. Gmail now supports line drawings, including colors, line width sizes, spray can, and there's even an eraser.
Some other changes include:
1) Users can now customize signatures when sending email from a mobile device.
2) They can also access and edit vacation responders.
3) There is a new notification sound for incoming mail in iOS 5 to more easily recognize incoming mail.
4) Labels have been improved, including support for nested labels.
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