invoiceninja/app/Mail/TemplateEmail.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2020. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Mail;

use App\Models\Client;
use App\Models\User;
use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

class TemplateEmail extends Mailable
{
    use Queueable, SerializesModels;

    private $build_email;

    private $user; //the user the email will be sent from

    private $client;

    private $footer;

    public function __construct($build_email, User $user, Client $client)
    {
        $this->build_email = $build_email;

        $this->user = $user; //this is inappropriate here, need to refactor 'user' in this context the 'user' could also be the 'system'

        $this->client = $client;
    }

    /**
     * Build the message.
     *
     * @return $this
     * @throws \Laracasts\Presenter\Exceptions\PresenterException
     */
    public function build()
    {
        $template_name = 'email.template.'.$this->build_email->getTemplate();

        $settings = $this->client->getMergedSettings();

        $company = $this->client->company;

        $this->from($this->user->email, $this->user->present()->name());

        if (strlen($settings->reply_to_email) > 1) {
            $this->replyTo($settings->reply_to_email, $settings->reply_to_email);
        }

        if (strlen($settings->bcc_email) > 1) {
            $this->bcc($settings->bcc_email, $settings->bcc_email);
        }

        $this->subject($this->build_email->getSubject())
            ->text('email.template.plain', [
                'body' => $this->build_email->getBody(),
                'footer' => $this->build_email->getFooter(),
                'whitelabel' => $this->client->user->account->isPaid() ? true : false,
                'settings' => $settings,
            ])
            ->view($template_name, [
                'body' => $this->build_email->getBody(),
                'footer' => $this->build_email->getFooter(),
                'view_link' => $this->build_email->getViewLink(),
                'view_text' => $this->build_email->getViewText(),
                'title' => '',
                // 'title' => $this->build_email->getSubject(),
                'signature' => $settings->email_signature,
                'settings' => $settings,
                'company' => $company,
                'whitelabel' => $this->client->user->account->isPaid() ? true : false,
            ]);

        //conditionally attach files
        if ($settings->pdf_email_attachment !== false && ! empty($this->build_email->getAttachments())) {
            foreach ($this->build_email->getAttachments() as $file) {
                $this->attach($file);
            }
        }

        return $this;
    }
}