set default auth_mode for smtp mail driver (#5293)
set default auth_mode for smtp mail driver (#5293)

Co-authored-by: KP <631d379f393433c90dda8e310a59214985f2f593@new-data-services.de>
hackel/laravel,hackel/laravel,cbnuke/FilesCollection,cbnuke/FilesCollection,slimkit/thinksns-plus,hackel/laravel,slimkit/thinksns-plus