Email Alias

Email Alias

I have created an email alias for my Superuser account.  It is sending messages fine using the alias, but anytime I send a message back to the alias, it returns undeliverable.  I get the following:
 

Your message did not reach some or all of the intended recipients.

 

      Subject:    Church

      Sent: 1/28/2013 11:05 AM

 

The following recipient(s) cannot be reached:

 

      admin@eleysford.org on 1/28/2013 11:05 AM

            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.

 
Any ideas?