Breaking: #97752 - MailerAdapterInterface removed¶
\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
Implementing the interface in custom extension code will trigger a PHP Error.
All installations implementing the interface in custom extension code, which is very unlikely. The extension scanner will report any usage as strong match.
Remove any usage of the interface in extension code.