" 554 5.7.1 <user@recipient.com>: Relay access denied "

" 554 5.7.1 <user@recipient.com>: Relay access denied "

Some of my clients have been receiving a bounce back email with the 554 5.7.1 error code. I've been trying to find the error of my ways but honestly am totally lost. Here's the full error.

The response from the remote server was:

554 5.7.1 <mua@lutherbeautydatabase.com>: Relay access denied

Final-Recipient: rfc822;  mua@lutherbeautydatabase.com
Action: failed
Status: 5.7.1
Remote-MTA: dns;  smtp-fwd.wordpress.com . (192.0.97.133, the server for the
 domain  lutherbeautydatabase.com .)
Diagnostic-Code: smtp; 554 5.7.1 < mua@lutherbeautydatabase.com > : Relay access denied
Last-Attempt-Date: Tue, 09 May 2017 20:32:11 -0700 (PDT)






Any help is greatly appreciated.