Blux does not handle email. You only need to configure the DNS records for your domain to point to blux to handle your website, you may keep your existing settings for email to continue to use your current email provider.
If you have a new domain and website with Blux and want to have the ability to send and receive email from your own domain then consider using one of these fine email providers:
Google AppsFastMailAmazon WorkmailOutlook.comYour email provider should provide you with the support & documentation necessary to allow your email to continue to work while your website is hosted with Blux.