Q:

TYPO3 7.6: disable fe_typo_user cookie

How can I deactivate the fe_typo_user cookie in TYPO3 7.6. I don't use fe_login or other data stored in sessions on this website, but the cookie is set. The website was updated from an earlier TYPO3 version. In this issue another user had the same problem with an updated version - as solution he obviously used a fresh installation of TYPO3. 
Isn't there another way to deactivate this cookie if not used? In earlier versions it worked with 
["FE"]["dontSetCookie"] = 1 

but in 7.6. obviously not anymore.
Edit:
The cookie is set new. I deleted it in chrome developer tools. You could check this webiste. I use powermail for contact forms, but as far as I know it doesn't set cookies. For tracking Piwik/Matomo is used, but it has it's own cookies "outside" of TYPO3. Conditions aren't used.

A:

Which version of powermail are you using?
Since v6.0 the session-spam-check is disabled by default. 
From release notes:

Task: Disable session-spam-check by default (to prevent generating a cookie)

