hook_mail_backend_info_alter(&$info)
Alter the list of mail backend plugin definitions.
array $info: The mail backend plugin definitions to be altered.
function hook_mail_backend_info_alter(&$info) { unset($info['test_mail_collector']); }
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https://api.drupal.org/api/drupal/core!core.api.php/function/hook_mail_backend_info_alter/8.1.x