Email is working however some emails are not being delievered to some domains and are being stuck in the queue
I did a check of our domain name on DNSstuff.com and it says 6 Blacklists Domain is listed on RBL
which is causing emails not to be delievered. How do I fix this and prevent it?
We have antivirus/spam running on all computers and email servers so not sure what to do to get our emails flowing again