Hi there. I am an IT admin at out company and for the last 2 days, we have had issues sending email to recipients who are using message labs. Here is a sample NDR:
----- Transcript of session follows ----- ... while talking to cluster5.eu.messagelabs.com.:
>>> DATA
<<< 553-Message filtered. Refer to the Troubleshooting page at <<< 553-http://www.symanteccloud.com/troubleshooting for more <<< 553 information. (#5.7.1)
554 5.0.0 Service unavailable
I have raised the issue with our smarthost 'Forcepoint' and they can tell me there is nothing we can do. We use hosted exchange domain 'ionix-systems.com' and route all mail through forcepoint. We have had this configuration for 5 years and have not seen this issue before.
Can you please advise why we are seeing this issue?
Regards,
Ian Bilsland