I have a problem that is driving me insane!! I have been battling this for months now.
Cutting a long story short i think i am being reveresed non delivery report attacked. I had many problems with my server being used as an open relay server even though i follwed the microsoft guidelines to stop open relay.
Now over the last week i am getting rndr attcked. This is a big problem as it is disrupting mail flow badly. I followed a microsoft troublshooting in restricting mail recipients mail flow but no luck!!!!!
I wanted to know if anyone could help. Also I wanted to use the mail hop relay service from dyndns to combat this. Does any one know if this will help me? Currently i use AVG Corporate edition but no spam software.
Or any other suggestions.
I have a SBS 2003 server std edt.