Contact Form Plugin - Not sending/receiving emails?
Welcome to Craft!

You mention you haven't configured any kind of mail server—this is almost certainly the issue.

There are a few mailer adapters for Craft, the availability of which will depend on whether you're using Craft 2 or Craft 3.

That said, the easiest route will probably be to use the built-in SMTP method, configured in the Settings -&gt; Email screen of the Admin.

I'd recommend checking out Mailgun or Sendgrid as third-party services that handle mail delivery—this way, you're not responsible for maintaining your own mail server. Both offer generous free tiers that should cover most use cases.

Each should provide you with some SMTP credentials you can drop into Craft's settings.

Be aware: some ISPs will block SMTP traffic over the standard port. If you still have trouble sending mail, look at the docs for your chosen provider and see if they support sending over an alternate port.

Good luck!