pds/app/Mail/VisitorMail.php

<?php

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Mail\Mailables\Content;
use Illuminate\Mail\Mailables\Envelope;
use Illuminate\Queue\SerializesModels;

class VisitorMail extends Mailable
{
    use Queueable, SerializesModels;

    public $visitor;

    /**
     * Create a new message instance.
     */
    public function __construct($visitor)
    {
        $this->visitor = $visitor;
    }

    /**
     * Get the message envelope.
     */
    public function envelope(): Envelope
    {
        return new Envelope(
            // subject: 'Visitor Arrival Notification',
             subject: $this->visitor->type === 'InterUnitStaff'
            ? 'Employee Arrival Notification'
            : 'Visitor Arrival Notification',
        );
    }

    /**
     * Get the message content definition.
     */
    public function content(): Content
    {
        $greeting = '<b>Dear Sir</b>';

        return new Content(
            view: 'mail.visitor-arrival',
            with: [
                'company' => 'CRI Digital Manufacturing Solutions',
                'greeting' => $greeting,
                'wishes' => 'Thanks & Regards,<br>CRI Digital Manufacturing Solutions',
            ],
        );
    }

    /**
     * Get the attachments for the message.
     *
     * @return array<int, \Illuminate\Mail\Mailables\Attachment>
     */
    public function attachments(): array
    {
        return [];
    }
}