$email = 'raihanniloy.mbstu@gmail.com';
         Mail::send(['text'=>'email'],['name','Automated_Library_Management_System'], function ($message) {
			 $message->to($email,'To Niloy')->subject('Test Mail');
			 $message->from('rajukichi@gmail.com','Rajukichi');
		 });

This is not working , Error = undefined variable email,

BUT
         Mail::send(['text'=>'email'],['name','Automated_Library_Management_System'], function ($message) {
			 $message->to('raihanniloy.mbstu@gmail.com','To Niloy')->subject('Test Mail');
			 $message->from('rajukichi@gmail.com','Rajukichi');
		 });
This method is working. WHY???