Hi all,
I have Exchange 2013 SP1 installation with all roles on one box. My initial configuration worked fine, I was able to send and receive emails just fine. Yesterday however, I noticed that emails were not flowing anymore and when I checked the Queue viewer, I saw thousands of SPAM emails being sent - most of them sent to yahoo.com.tw domain. I managed to clean the Queue and I unchecked the anonymous authentication on the default frontend connector and the SPAM stopped but we cannot receive emails anymore (sender gets 530 5.7.1 Client was not authenticated message).
As soon as I enable anonymous, SPAM starts again. I don't have an external relay, I am sending email directly from Exchange. Can you guys offer any advice as to how to go about this? How do I enable send/receive emails without getting all this SPAM?
DB