Supporting Keyboard Types
iOS supports several keyboard types (default,email, url, phone)*. Webviews can set the type of the keyboard.
This support-page sets the type "email" for the field for the emails. The Apple keyboard respects this setting (see first picture). padkey doesn't respect this setting (see second picture).
Thomas Schewe commented
NOTE: The picture are shown in the wrong order: The "first" is IMG_588.PNG on the right and the "second" is IMG_589.PNG on the left.