Breaking: #97752 - MailerAdapterInterface removed 

See forge#97752

Description 

The \TYPO3\CMS\Core\Mail\MailerAdapterInterface has been removed, since the interface became unused in v7 due to removal of Core's SwiftMailerAdapter implementation, which had been used as hook subscriber in the also removed MailUtility::mail() method.

Impact 

Implementing the interface in custom extension code will trigger a PHP Error.

Affected installations 

All installations implementing the interface in custom extension code, which is very unlikely. The extension scanner will report any usage as strong match.

Migration 

Remove any usage of the interface in extension code.