We no longer support external port 25 php mail setting and unauthenticated outgoing emails. This guide will show you how to send mail from your applications securely.
If you setup a web form on your website, you'll need to ensure your script supports authentication.
This will be a setting that allows you to authenticate a username / password into your script telling the mail server that your a fully valid user. The reason for this implementation is to reduce possible spam, we scan all outgoing emails regardless of authentication.