My company have two exchange 2010 servers( mail1 & mail2). Both have Client, HUB, and Mailbox roles installed on them with DAG configuration.
Now my two questions are:
1)After activating the Anti-spam feature on Hub Transport,I open the Sending Filtering & add some domain to the Blocked Senders. But sender from those blocked domain still can send e-mail to recipient in my company.
2)they all have 3 thing in common that appear in Exchange Queue Viewer
- From Address is BLANK. shows as <> in Exchange Queue Viewer List item
- Source IP of those emails is all the same and it's not valid 255.255.255.255
- List item 95% say Undeliverable: in the Subject line
Help me to resolve! Thanks!