Hi there,
We have been experiencing ongoing sending issues to many domains that utilize Messagelabs services. Most boucebacks that we are receiving state that messages are being delayed, in which the messages are not sent at all. We have confirmed that we are not on any kind of blacklist and all of our SPF records are correct. We have noticed many threads on the Symantec site explaining that this is an ongoing issue with messagelabs services and we are experiencing that exact same problems. Are we able to have some assistance looking into this issue? Our IP is 184.71.14.234, thank you for your help. Here is a link with similar issues that we too are experiencing:
https://www.symantec.com/connect/forums/problems-emails-going-through-messagelab-servers
Thanks,
Daxtech