XF 1.5 Confirmation emails not sending

[Crimsonwrath]

Hello, I setup a forums website today with Namecheap using Xenforo files. When users attempted to signup, they did not recieve a confirmation email. I received these error reports.
https://gyazo.com/b4e266bb378d9ee8049f059a0e142dba
What can I do to fix this?

 

[Mike]

This indicates that your server's PHP mail configuration hasn't been setup correctly. You may need to contact your host to have them look into it. Otherwise, you'd need to change XenForo's email options to use an external SMTP server.