Another problem with this service - since it is meant for personal email - is that if too many emails are sent out within a certain time period, your domain name will be flagged for abuse… and disabled for several days (5 to 7) for the first offense. You will not have any access at all to your domain(s). They actually flag the registrant’s name and any domains you have with that registrar are disabled.
(I accidentally found this out the hard way just by forwarding too messages from one mailbox to another mailbox I have in too short a period of time.)
You are much better off going with an actual mail service like those suggested.