Just because roundabout likes to mess with me, I'll contribute this to the noob section. As I was starting out mailing, there was never a real emphasis on the data side of my operation. I went for the most amount of records for the least amount of money. BAD DECISION. Mailing to dirty data was the single biggest headache for the operation. Servers went down constantly and put the mailing to a grinding halt every few days. Some of the forum members here probably remember flaming me for doing such a thing. After reading the golden gems on this forum, I decided to buy from one of the reputable data dealers and get the data cleaned. The results were night and day! Servers and ips were fairing much better than before and now they last months instead of days. Less focus on getting off blacklists and I end up avoiding them all together. Data is now the single most valuable factor I pay attention to while mailing (besides IPs). Now I use 3 different cleaning services that are reputable on this forum. I have no idea if I should post their names on this post but I'd gladly point to them if a noob wants to clean up their act and mail cleanly. Don't learn this lesson the hard way.