We recently upgraded to Exchange 2013. We have a single server setup with transport and mailbox roles on the same machine. We have noticed a dramatic increase in SPAM and I have started to notice our IPBlockListProviders don't seem to be blocking. I've run Test-IPBlockListProviders and it responds as I would expect with a known blocked IP. However email still continues coming into mailboxes from that IP. I've noticed some people stating that Microsoft removed connection level filtering.
Is this true? If so how do I use DNSBL to stem the flow of SPAM?
Todd Schoenfeld 1 Computer Consultant Little Elm, TX 75068