Using Homestead Roundcube Email for the first time...sends but does not recieve

I recently started using my Homestead Roundcube email.  I set up the email.  Sent a test to three other addresses...received.  However I cannot get Roundcube to receive any emails...at all.  Not replies or direct.

Here is the error I received:

This message was created automatically by mail delivery software.A message that you sent could not be delivered to one or more of itsrecipients. This is a permanent error. The following address(es) failed:[Email addy here]The following text was generated during the delivery attempt:[Email addy here]recipient does not have an account.