Sending simple emails should be easier in Nette Framework.

config.neon

common:
	services:
		mailer: App\Mailer

example.php

<?php

// $mailer instanceof App\Mailer === true

$mailer->easySend('admin@example.com', 'user@example.com', __DIR__ . '/hello.latte', ['greeting' => 'Howdy']);

Mailer.php

<?php

namespace App;


class Mailer
{

	/** @var \Nette\Mail\IMailer @inject */
	public $mailer;


	public function easySend($from, $to, $templatePath, $templateValues = [])
	{
		// Template
		$template = new \Nette\Templating\FileTemplate($templatePath);
		$template->registerFilter(new \Nette\Latte\Engine);

		foreach ($templateValues as $key => $val) {
			$template->$key = $val;
		}

		// Mail
		$mail = new \Nette\Mail\Message();
		$mail->setFrom($from)->setHtmlBody($template);

		foreach ((array) $to as $t) {
			$mail->addTo($t);
		}

		$this->mailer->send($mail);
	}

}

Děláš modelovou třídu, bylo by mnohem lepší použít konstruktor injection.