Hi Frank. Most of our customers use a combo of Declude (100% Free), Message Sniffer (Free trial, paid subscription) and SmarterMail's SMTP incoming connection checking (using a few very reliable RBLs). This seems to work extremely well for people if these things are configured properly. If you would like to give this combo a try, you can download Declude100% free of charge from our website mailsbestfriend.com/downloads. If you like, I can set you up with a free Message Sniffer trial which will plug into Declude. There is no obligation to buy anything. I can also help you to properly configure the SM SMTP incoming connection checks properly. Please let me know if you would like me to assist. Thanks!