Using Jamroom
You're on jamrooms servers so email will be sent out via mailgun connected to our mailgun account.
It looks like your domain name has just recently been changed and there is a message here:
https://www.jamroom.net/dean-venier/hosting/domain_config/565/id=2090
Quote: Pending Email Validation
Email delivery may not work until the primary domain is validated - please allow up to 24 hours for validation
Email delivery may not work until the primary domain is validated - please allow up to 24 hours for validation
Once that's complete then the site will be able to send out email.
You are free to change it to a SMTP server if you like but its not required.