Double At is a tweak released last evening in Cydia that allows iDevice owners to enter their email address automatically in any text field using a double tap on the screen. Double At has a settings menu directly in the iOS Settings application and there you can enter the email address that will be automatically written in the text field you tap. Considering that a double tap is required to automatically enter the email address, it is logical that this tweak works with the help of the Activator, so it will affect the performance of your terminal to a certain extent.
Double tap the @ key when typing to quickly insert your email address. Email address can be set in Settings under "Delete @"
Double At is available for free in Cydia in the BigBoss repo.
