Hi there, got this PHPMailer exception after deploying my project to Heroku. Locally everything is works. Website can be loaded, only after firing $kirby->email the exception comes 
I am new to platforms like Heroku, was looking for something more “manageable” then shared hosting. Maybe Heruko is not ideal?
PHPMailer\PHPMailer\Exception: Could not instantiate mail function. in /app/vendor/phpmailer/phpmailer/src/PHPMailer.php:1720 Stack trace: #0 /app/vendor/phpmailer/phpmailer/src/PHPMailer.php(1518): PHPMailer\PHPMailer\PHPMailer->mailSend() #1 /app/vendor/phpmailer/phpmailer/src/PHPMailer.php(1352): PHPMailer\PHPMailer\PHPMailer->postSend() #2 /app/kirby/src/Email/PHPMailer 2.php(74): PHPMailer\PHPMailer\PHPMailer->send() #3 /app/kirby/src/Email/Email 2.php(41): Kirby\Email\PHPMailer->send() #4 /app/kirby/src/Cms/App 2.php(478): Kirby\Email\Email->__construct() #5 /app/site/snippets/registration.php(65): Kirby\Cms\App->email() #6 /app/kirby/src/Toolkit/Tpl 2.php(37): require('/app/site/snipp...') #7 /app/kirby/config/components.php(183): Kirby\Toolkit\Tpl::load() #8 /app/kirby/src/Cms/App 2.php(1271): Kirby\Cms\App->{closure}() #9 /app/kirby/config/helpers.php(699): Kirby\Cms\App->snippet() #10 /app/site/templates/default.php(5): snippet() #11 /app/kirby/src/Toolkit/Tpl 2.php(37): require('/app/site/templ...') #12 /app/kirby/src/Cms/Template.php(167): Kirby\Toolkit\Tpl::load() #13 /app/kirby/src/Cms/Page.php(1156): Kirby\Cms\Template->render() #14 /app/kirby/src/Cms/App 2.php(598): Kirby\Cms\Page->render() #15 /app/kirby/src/Cms/App 2.php(926): Kirby\Cms\App->io() #16 /app/index.php(5): Kirby\Cms\App->render() #17 {main}