How to change SwiftMailer temporary folder in Laravel

Sometimes if you sending a lot of emails, it can make /tmp/ folder very quickly filled up with cache file, and in my case it make the Apache and MySQL failed to start. The message error in Apache error_log is Fatal Error Unable to create lock file: Bad file descriptor (9).

In Laravel you can change the swiftmailer temporary folder, for example in storage/app/ folder.

We can set it boot() method in AppServiceProvider file :


     * Bootstrap any application services.
     * @return void
    public function boot()
         * Somehow PHP is not able to write in default /tmp directory 
         * and SwiftMailer was failing.
         * To overcome this situation, we set the TMPDIR environment 
         * variable to a new value.
        if (class_exists('Swift_Preferences')) {
        } else {
            \Log::warning('Class Swift_Preferences does not exists');

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