SMTP authentication on GoDaddy Server cPanel and Mail

I have recently been migrated to GoDaddy cPanel from (mt) and since then none of my contact froms work as I need to send via SMTP. Easy enough but I can’t seem to get it to authenticate with GoDaddy. Their support is pointless. My code in config.php:

'email' => [
  'transport' => [
    'type' => 'smtp',
    'host' => localhost,
    'port' => 25,
    'security' => false,
    'auth' => false

according to docs here, this is correct (?)

If anyone has managed to solve a similar experience I’d appreciate the help.