Log out of all devices? How?

[rphil]

Hello. How do you log out of an email account on all the devices Aqua Mail Pro is installed on?  I have AquaMailPro installed on my Android phone and Android Tablet. I need to take my tablet in to be repaired and possibly send it back to the manufacturer. I am concerned that anybody who repairs my tablet can just press the icon and read all my business emails.  If it is not possible to log out of all devices does anybody have a suggestion that could solve this potential security problem for me? Thank you.

[Kostya Vasilyev]

You can log out of all devices by changing your password in all your mail accounts.

But the messages will stay on the device.

I second Paris Geek's suggestion -- if you won't have control of the device, it would be better to uninstall all apps with personal data, maybe even do a system data reset -- then restore everything when you get it back.