Important: #97159 - MailLinkHandler key in TSconfig renamed 

See forge#97159

Description 

The key for the MailLinkHandler in the TCEMAIN.linkHandler. TSconfig has been renamed from mail to email.

This is done to be consistent with the identifier, used for the $GLOBALS['TYPO3_CONF_VARS']['SYS']['linkHandler'] registration, as well as the value of the LinkService::TYPE_EMAIL constant.

Update any usage of this key in your extension code.