Fixed #7099 - set email to null by default for backup notifications

.env.example

@@ -43,6 +43,7 @@ MAIL_FROM_ADDR=you@example.com
 MAIL_FROM_NAME='Snipe-IT'
 MAIL_REPLYTO_ADDR=you@example.com
 MAIL_REPLYTO_NAME='Snipe-IT'
+MAIL_BACKUP_NOTIFICATION_ADDRESS=you@example.com
 
 # --------------------------------------------
 # REQUIRED: IMAGE LIBRARY

config/backup.php

@@ -132,7 +132,7 @@ return [
         'notifiable' => \Spatie\Backup\Notifications\Notifiable::class,
 
         'mail' => [
-            'to' => 'your@example.com',
+            'to' => env('MAIL_BACKUP_NOTIFICATION_ADDRESS', null),
         ],
 
         'slack' => [