I have an issue with accepting email from one of external user, haeco.com. It not happened to all email from this domain. Some email from this domain able to reach internal user without any issue.
Our mail flow:
Symantec | Edge Server | Hub Transport | Mailbox
The NDR informed that 550 5.7.1 Message rejected as spam by Content Filtering.
After did some troubleshooting, I found out that this might be due to Edge Content Filtering settings. The settings said that "Reject email as spam if SCL greater or equal to 7"
I did checked a log at C:\Program File\Microsoft\Exchange\Tr
Please refer to screenshot. The screenshot show many result. FYI sender and recipient are same person in all result.
As you can see, the SCL keep changing although it was sent from the same sender and the sender only attached multiple excel file (checked on symantect email tracking).
It is tools available that I can use it to process the original email from sender, if there a few hidden not allow content type exist on the email since what I can see is the sender only send an excel file/pdf