Relay error message

[Eric Ward]

I get the below error message when send email.  Is this a DNS configuration
issue?


----------------------------------------------------------
This Message was undeliverable due to the following reason:

Each of the following recipients was rejected by a remote mail server.
The reasons given by the server are included to help you determine why
each recipient was rejected.

    Recipient: <info at ddcscuba.com>
    Reason:    5.7.1 Unable to relay for info at ddcscuba.com


Please reply to Postmaster at home.com
if you feel this message to be in error.