laravel电子邮件验证不会发送

Question

我在laravel 5.8中具有自定义注册控制器，它返回：

没有发件人地址就无法发送消息

代码

Controller

public function newRegisterSend(Request $request) {
        $this->validate($request, array(
            'username' => ['required', 'string', 'max:255', 'unique:users'],
            'email' => ['required', 'string', 'email', 'max:255', 'unique:users'],
            'password' => ['required', 'string', 'min:8', 'confirmed'],
        ));

        $user = User::create([
            'username' => $request->input('username'),
            'email' => $request->input('email'),
            'password' => Hash::make($request->input('password')),
            'first_login' => Carbon::now(),
        ]);
        $profile = new Profile;
        $profile->user_id = $user->id;
        $profile->save();

        $user->assignRole('non-employee');
        $user->changee()->insert([
            'changeable_id' => $user->id,
            'changeable_type' => 'App\User',
            'creator_id' => $user->id,
            'updator_id' => null,
            'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
            'updated_at' => Carbon::now()->format('Y-m-d H:i:s'),
        ]);
        $user->sendEmailVerificationNotification(); // sending verification email
        return $user;
}

route

Auth::routes([ 'register' => false, 'verify' => true ]);

user model

class User extends Authenticatable implements MustVerifyEmail {
  //...
}

.env

MAIL_FROM_ADDRESS=example@example.com
MAIL_FROM_NAME=MyApp

有什么主意吗？