Laravel - Send Mail in Future based on condition

I want to send emails to various users based on the schedules they have set.

I read about beanstalkd, queues and Delayed Message Queueing and for now it looks like fitting in:

$when = Carbon::now()->addMinutes($minutes); // i can calculate minutes at this moment
\Mail::to($user)->later($when, new \App\Mail\TestMail);

But i'm not quite sure on few things:

1. User can cancel a future schedule. In that case how do i cancel an email that's suppose to send in future. Can i set condition somewhere that gets checked before sending the actual email? Tried return false on handle method of \App\Mail\TestMail and it started throwing error

2. Am i using the right approach. I also read about Scheduler but i don't get how i am going to cancel future emails(if they need to be)

via Kanav