We are currently unable to send to many domains that use the Symantec Cloud for spam filtering Up to about 48 hours ago, we had no issues in sending emails these emails. We have a very large
number of receipents that have been affected. Please see error response below.
I have looked at the read me supply by the link below, but there’s nothing there that indicates what might be causing not been able to send emails to these receipents. Our SPF/DKIM records are setup correctly.
Our sending IP address is not blacklisted.
The content of the email has not changed. I would be grateful if maybe I could be able to find out the issue and hopefully resolve as quickly as possible.
I can supply any further information that might be required.
Thank you in Advance for any help that can be supplied.
Your message did not reach some or all of the intended recipients:
Error Type: SMTP
Remote server (184.108.40.206) issued an error.
hMailServer sent: .
Remote server replied: 553-Message filtered. Refer to the Troubleshooting page at
553-http://www.symanteccloud.com/troubleshooting for more
553 information. (#5.7.1)