Fixes bug where emails are sent to blocked addresses

[gseph]

As per title, this PR fixes a bug introduced by the adoption of Laravel 9.x which uses symfony/mime since Laravel 7.x.

Blocked email addresses would not be filtered out when sending emails.

Environment info

• PHP 8.2
• WinterCMS 1.2.3 (I'm assuming the bug got introduced since version 1.2.0 since it requires Laravel 9.x)

Steps to reproduce the bug

• Create and set up a WinterCMS project.
• Add the user plugin.
• From backend, manually create and activate two users.
• Edit the first one by checking the checkbox to block all emails towards that user.
• Set up a mail server. I'm using MailHog with docker, here's the docker-compose.yaml file I've used.

version: '3.5'

services:
  db:
    image: mysql:8.0.33-debian
    container_name: "db"
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: ${DB_PASSWORD}
      MYSQL_DATABASE: ${DB_DATABASE}
      DB_USER: ${DB_USERNAME}
      DB_PASSWORD: ${DB_PASSWORD}
    volumes:
      - "./docker-volumes/mysql-data:/var/lib/mysql"
    ports:
      - "${DB_PORT}:3306"
  mailhog:
    image: mailhog/mailhog
    container_name: 'mailhog'
    ports:
      - "1025:1025"
      - "8025:8025"

• Email the blocked user. Easily done it from the artisan tinker.

\Mail::raw('test body', function($m) {$m->to(['[email protected]'])->subject('test subject');})

You'll notice that the email gets sent to the blocked email address.

Also, email addresses in the cc and bcc fields were never going to be filtered out since the method MailBlocker::filterMessage only ever tried to filter out the main recipients.