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Email bounce back

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I need a solution

Hi

I am having problems email 2 seperate companies that both use symnatec cloud.

I have checked the blacklists and that is fine and checked with my ISP twice and they confirm that everything is setup fine. It started happening 2 days ago. What is more strange is that I tried 2 different email addresses and both bounced back. Do you have any idea what to do. I have just tried sending one an email through webmail to see if that works.

Thanks for any help.

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

 CCastro@simon.com
   host cluster9.us.messagelabs.com [216.82.249.35]
   SMTP error from remote mail server after end of data:
   553-Message filtered. Refer to the Troubleshooting page at
   553-http://www.symanteccloud.com/troubleshooting for more
   553 information. (#5.7.1)
Reporting-MTA: dns; eris.servers.prgn.misp.co.uk

Action: failed
Final-Recipient: rfc822;CCastro@simon.com
Status: 5.0.0
Remote-MTA: dns; cluster9.us.messagelabs.com
Diagnostic-Code: smtp; 553-Message filtered. Refer to the Troubleshooting page at
553-http://www.symanteccloud.com/troubleshooting for more
553 information. (#5.7.1)
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