sending out +300 emails using Mail:queue

Hi Laravel users,

I'm building an application sending out notification emails to users every 3~4 months. I'm currently using Mail queue.

// foreach user
     // generate a custom message for this user
     Mail::to( $mail_to )->queue( new CustomMail( $subject, $custom_message ) );

// return to success page

However, I have a few concerns with this:

1. Would it cause a serious CPU / RAM usage and possible crash the server? I'm currently using Digital Ocean - 2 vCPUs 4GB / 80GB Disk

2. If Mail::queue crashes, the rest won't be running. I will prevent it by having try and catch... but is there a better way?

3. It doesn't leave any logs... how do you do log and check if every email is successfully sent out?

4. I know there are some third party API solutions for this... do you have any other better solutions than relying on laravel?

I'm currently using Sendgrid for sending out emails.

Thanks.