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Emails from our domain blocked by companies using Symantec cloud

I need a solution

Emails from our domain are being bounced back by companies using Symantec Cloud with the following message:


The problem appears to be :

-- Recipient email server rejected the message

Additional information follows :

-- Message filtered. Refer to the Troubleshooting page at for more information. (#5.7.1)


We are not on any blacklists and I have already submitted samples to as instructed in reference link:

I have not had a reply and our emails are still being blocked. Please can this be looked into?